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.

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.

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.

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
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