how can we use tally for big inventory business like marts etc. do we have to enter all the items manually

Hi Muhammad, We don't have default list/category/catalogs in TallyPrime. However, you can create multiple items/categories at once. For more details, please follow this link: https://help.tallysolutions.com/tally-prime/accounting/charts-of-accounts-tally/ and follow the section "Manage Multiple Stock Items | Multi Create & Multi Alter Using Chart of Accounts"