I currently don't maintain MRP in BUSY. What do I need to do to enable entering purchase and sale prices separately?

To maintain MRP wise details feature in BUSY, follow the below steps:
1.To enable MRP wise details feature:
Step 1: Go to administration then click on configuration menu
Step 2: Choose the features and option then select inventory tab
Step 3: Enable the MRP wise details then Click on configure tab and tick on Maintain Sales price along with MRP and save the configuration.
2.To enable MRP feature in item master:
Step 1: Go to administration then click on master menu
Step 2: Choose the item option then select modify tab
Step 3: Specify Y to enable the MRP wise details feature and save the master.
3.To post entry with MRP wise details:
Step 1: Go to transaction section then click on purchase voucher type
Step 2: Select the add option then specify the header part of invoice.
Step 3: At body part, after entry the item details, MRP wise details window will appear where you need to specify the MRP and sales price.
Step 4: Save the invoice after create with required details.
4.To adjust the MRP wise details at sales invoice.
Step 1: Go to transaction section then click on purchase voucher type
Step 2: Select the add option then specify the header part of invoice.
Step 3: At body part, after entry the item details, MRP wise details window will appear where you can adjust the MRP and sales price.
Step 4: Save the invoice after create with required details.