When 80% of your inventory is strain based, restocking every SKU that runs low is a trap. Strains rotate. They substitute for each other. Reorder each one individually and your inventory quietly multiplies while your cash flow quickly disappears.Product Lines in Happy Buyers is built to ask better questions. How do my customers actually decide what to buy? Which products replace each other? How much of each subcategory am I really moving?Instead of chasing individual SKUs, you manage buckets of inventory tied to how customers shop. You set your depth, your parameters, and the platform does the heavy lifting in real time.