Tags can be added for a set of tasks simultaneously using group actions. In any view of the tasks module, click the Group Actions button near the top of the module and select Add Tags to open the pop-up wizard.
The pop-up will list the available tasks. Select the tasks by clicking on each, or click the Select All button to select all the listed tasks. To remove a task from the selected column, click on the corresponding . When ready, click the Next button. In the next screen, select the tags to add from the list of available tags. Click Submit to continue with adding the tags. Note that new tags can be created in the Settings tab.
Note that this group action feature is available to users that have access to the tasks module. The list of tasks provided under a group action will be those for which the user has access.