merchmix.

FOR BUYERS

Commit the buy while the budget is still in view.

The moment a range plan leaves the platform it stops being true. Merchmix holds cost, RRP, margin and the size breakdown on every line, with open to buy moving as the buy is committed, so nothing reaches a purchase order until the numbers stand up.

WHAT YOU GET

Four things buyers get out of it.

Know the range is not quietly getting crowded.

Option counts are set per subcategory with the split between continuity, seasonal and fashion held, and variance against recommendation shows on every line.

See the margin before you commit, not after.

Units, landed cost, RRP and first margin sit on every style, with total buy value recalculating as quantities change.

Stop buying an average of two different seasons.

The curve is built from the year, season and trading weeks you choose, so a launch is bought on launch behaviour rather than a rolling annual average.

Know the real cost before you award.

Demand across styles is consolidated into one costed brief, quotes in different currencies are normalised to one comparable cost, and the target margin is held as bids arrive.

Option Plan takes its target from Budget Builder and hands approved option counts to Range Plan, which turns them into styles and a buy, and the committed buy sends intake back into the plan.

THE CYCLE

Count the options, build the range, buy the curve.

The buy runs through three stages, and each one reads the numbers the last one committed. The buy that reaches your ERP is the same one the team planned.

Set the option count before the range gets crowded.

Ranges get crowded quietly. A few extra options per subcategory, repeated across a season, and the money is committed before anyone has counted. Option Plan sets the number the season actually needs, holds the split across continuity, seasonal and fashion, and shows how far each subcategory sits from what your own trade supports. Drops are phased month by month, and each cell opens on last year's performance for that month before anything changes.

Option Plan sets option counts and split across continuity, seasonal and fashion

Commit the buy while the budget is still in view.

Range Plan holds units, landed cost, RRP and first margin per style, with total buy value recalculating as quantities change and the size split settled on every line before the order goes near a supplier. Committed buy is tracked against open to buy with remaining headroom visible, and lines are flagged where detail is incomplete.

Range Plan with cost, margin and open to buy tracking

Buy the size curve for the weeks you are planning for.

An annual size curve is an average of two different businesses. Peak weeks sell a different shape to quiet ones. Size Analysis builds the curve from any year, season and week range, names the size furthest out of balance and the quantity that corrects it, and carries that straight into the order. Separate grids per category mean footwear and dresses work to their own size sets.

Size Analysis showing size curve optimization by category

Each stage commits into the next, so the option count you signed off is the buy that reaches the ERP, and the same curve carries into store level allocation.

Frequently asked questions about retail buying

Merchmix is a merchandising and inventory operating system with intelligence at its core, helping retailers connect planning, buying, allocation, suppliers and execution in one platform. For buyers it runs option planning, range building, size buying and the handoff to the ERP in one workspace, with cost, margin and open to buy visible on every line, so the buy that reaches the purchase order is the one the team planned.

Recommended counts are drawn from last year and the year before, per subcategory, with variance against target shown on every line. The plan holds the split across continuity, seasonal and fashion, and ranks last season's styles on gross profit and weeks of cover so the team can decide what repeats, what drops and what still needs building to reach target.

Yes. Units, landed cost, RRP and first margin sit on every style in the range plan, and total buy value recalculates as quantities change. Committed buy is tracked against open to buy with remaining headroom visible throughout, so the budget position is read at the point of decision rather than reconciled after the order has gone.

From any year, season and week range you choose rather than a rolling annual average, because peak weeks sell a different shape to quiet ones. Sales mix is compared against stock mix for every size, the largest gap is named, and the size to prioritise is called out with the quantity that corrects it. Separate size templates per category mean footwear and dresses work to their own grids. For the underlying calculation, see our guide to size curve optimisation.

Yes. The range is grouped by supplier and pushed to your connected ERP, and purchase order raised and delivered status tracks back against every line, so the buy that was planned is the buy that was placed. The ERP remains the system of record for stock, and intake feeds back into the merchandise financial plan, which means the season's committed buy is visible in the weekly position rather than sitting in a separate file.

Costing usually happens in a spreadsheet, in three currencies, after the range is already set. Cross Costings consolidates demand across styles into a single costed brief, with specification and target cost set before it goes out, then normalises every quote so suppliers bidding in different currencies are judged on the same basis. The delta against target margin is visible on every brief, and the awarded cost lands back on the range margin rather than being re-keyed into it.

Option plans carry commercial notes per subcategory, an approval status and a full history of who changed what and when. The plan is the gate: it moves to Range Plan only once it is signed, so a range cannot be built against an option count nobody approved. Approval is a person every time, and the approved version is the one the buy is measured against at the end of the season.

No. Most retailers start with the planning layer and add allocation, suppliers or the wider system afterwards. Every module added works off the same live numbers from the day it is switched on. Onboarding runs as a six-week proof of concept on your own data, so the first thing a team sees is its own range rather than a demonstration tenant.

Build one range on your own numbers.

A six-week proof of concept on your own data. Bring a category and last season's actuals, and see the option count, the range plan and the size curve in one place.

Updated 4 September 2026