Whenever needed, you can turn tags from any project into global tags. All that you have to do is go to the required project, select the tags and use the "Make as Global" option.

To make a project tag global:

1. Click the Projects tab on the left pane.

2. Select the desired project from the project listing.

3. Go to Tags.

4. Select the desired tags or all the tags in the group by clicking the checkbox that is displayed when you point your mouse over them.
   
   

5. In the actions that are displayed in the band right above the tag groups, click the Make as Global button.
   

6. In the "Make as global" window that pops up, select the target tag board and tag group, and click Make global.