To add priced modifiers: 

Step 1: Visit Setup > Menu Setup.
Step 2: Search for the appropriate menu item in the search field and click Edit.
Step 3: Scroll to the New Item Modifiers section and select the group.
Step 4: Add modifiers by typing it in the Search Item Name field and press Enter. If the modifier has an additional price, enter it in the Additional Price field.
Step 5: Click Save and Refresh POS Menu Items.

Watch our video on Creating Modifiers in Sapaad: