Why can't I link an activity in my Matter Template?
Matter Template Events and Tasks can be linked to create cascading activities.
If you are unable to link a parent activity to an Event or Task, it is likely that your parent activity has not yet been designated as a milestone. Designating your event or activity as a milestone will enable other activities to be linked.
The following instructions show you how to edit an Event or Task so that they are 'linkable'.