On the "Project" tab, if the purchasing quotation document is related to "Project" or a WBS project document, you can select the project in the "Projects" window and save and send the project. If you want to link the WBS of the project, you can do the same.
If you want to associate more projects, select the first one and type "% Rate" and save. The system will show another two-row field to add more projects and WBS items and will show the remaining % rate to complete 100%.
To delete project records, you must check the "Delete" checkbox and click the "Delete" button.