Woffice has an handy feature that let you link projects to your BuddyPress groups. To get it working, please follow those simple steps: 

You need to enable the option from the Theme Settings > Posts/Wiki/Projects > Projects: 

Whenever this option is enabled, that will create one new project category per BuddyPress group. 

To link a project to a group, you simply need to choose the group name as the project's category. Once done, the project will be listed on the group page and the members will be synchronised.