Granite by area and by weight
Stone is quoted by the square foot for slabs, by the piece for cut sizes and sometimes by weight for blocks, often to the same buyer. Holding the unit and conversion against each item means one bill handles all of it with the arithmetic done, and the wastage allowance shown as its own line rather than folded into a rate.
Lot matching for a returning customer
Stone from different lots does not match, and a customer who returns weeks later for two more slabs expects the same shade. Keeping each lot as its own item with its own rate and stock answers that without walking the yard, and it stops a premium lot being sold at an ordinary lot's rate.
Supplying the district
Loads leave for towns across northern Telangana on hired vehicles to buyers seen occasionally. The challan with the date, vehicle number, destination and receiver is the only evidence the load arrived, and it stays against the party permanently, resendable on WhatsApp when it is questioned.
Mixed GST on ordinary bills
A contractor buying for a slab takes cement at 28%, steel at 18% and aggregate at 5% in one load. Because the rate sits on the item, each line takes its own and CGST and SGST are worked out per line — the normal case here rather than an edge case.
Setup by phone
Thirty minutes covers your details, items with the right units, parties with opening balances and your bill format. Support afterwards runs in Hindi and English, and the Android app bills offline through the power cuts that are routine in the district.