If you want to select multiple processes in a process project, select the check box corresponding to the process project on the left to select the entire process project on the right. Click the .project file to clear the check box; only .process files can be exported.

If you want to select one or more process files manually, without selecting the entire process project on the left, select the name of the process project and then select the boxes corresponding to the process files you want on the right. If you want to remove a check mark, select the box again to clear it.