There are two way of creating Purchase Bill. 1 Direct Purchase bill 2. Purchase bill through GRN

1.      Direct Purchase Bill: you can create Purchase bill directly. for creating purchase bill directly just follow these steps -

      Purchase module >Transactions>Purchase>Purchase Entry (Billing)>Add >click on save 

A. Direct Purchase Bill 

2.      Purchase Bill through GRN: You can create a purchase bill of Done GRN. Go in purchase: transaction: Purchase: Purchase through GRN: Fill the required information. Click on save

      Purchase module >Transactions>Purchase >Purchase through GRN >Add >click on save 

B. Purchase Bill through GRN