If you wants to enter voucher under composition firm you have follow below given steps:-
Step 1: Go to the transaction menu, click on Sale, and then select the add option.
Step 2: Define all voucher details, such as voucher series, date, voucher number, and sale type, either Local No-tax or Central No-tax.
Step 3: If you have exempt items that you have already defined within the item master, you just need to define the item name with its quantity, price, and amount at the voucher level. For taxable items, if you want to show tax at the voucher level so that you can take a printout, you can apply taxes in bill sundry under ITC eligibility as None.
By following these steps, you can successfully enter a voucher under the Composition firm in BUSY.