How do I set up the Manage Contracts to Trades Page? In the Attach Contract section, select a trade. You can filter the contract type from your Client Contracts or Vendor Contracts by selecting the proper radio button. Once selected, only the Client or Vendor contracts will appear in the Contract by Client/Vendor, by Date and by Name drop-down menus. Select the contract you wish to attach. Enter the Quantity Associated with this contract and add any additional notes, as desired. When you are finished, click the Attach button to complete attaching the contract. If the contract attaches successfully, a Success message will briefly appear.