1. Navigate to the Contract Register.
2. Click on the contract in the centre pane. The contract will show in the right hand pane.
3. Click on Subcontract Variation.
4. The variation will open in a new window.
5. Give the variation a title.
6. Action to relevant person.
7. Change the status to Pending Approval.
8. Add line items for the Variation by typing in a description and entering Cost Rate and Quantity.
9. (Optional) You can indent rows to create Line items and totals.
10. (Optional) Attach any supporting documentation if required.
11. Click Submit.
Refer here for Creating Variations and Linking to Different Budget Lines.