On Products, list each line once: SKU, name, category, unit, opening stock, reorder level, and your buying and selling price in KES. On Movements, record each In and each Out with the date, the product, the quantity and which warehouse. Current stock is opening plus in minus out, and Warehouse Stock shows how many units of each product sit in each store.
A status column turns amber at your reorder level and red when a line hits zero, so you reorder before a customer walks. Yellow cells are your only inputs and every other cell is a locked formula, so the maths cannot break. The premium version adds a dashboard of stock value by category and warehouse, a category analysis and a printable A4 stock report. Opens in Excel, WPS or Google Sheets.