To link projects to clients, you will need to add the field  Full client name to the Projects form by following these steps:

1. Settings > Applications > View and Form Configurator
2. Search for Projects > Enter the project form
3. Open the folder   Fields > Drag the field Full client name
4. Save

Afterwards, you can create the project directly from within the client:

1. Click on More > Clients
2. Open the relevant client > click on New > New project
3. Fill in the fields (Project name, Project manager, Start date)
4. In the Full client name section, select the client you want to link the project to from the available list
5. Click Create