When actioning an item if you have an issue come up that prevents you from completing the item, you can create an issue and assign this to the person that can help resolve the issue.
Within the Action Item record you will see a Related Issues TAB, where all the issues relating to this record can be found.
To create an Issue click on 'New Issue' at the top right of the grid in the Related Issues TAB.
This pop-up will appear where you can provide as much detail as possible on the issue, assign it to your manager or co-worker (or yourself if you are still unsure who can help you to resolve it), provide recommendations and then click NEXT.
You will now find the issue has been created, the person assigned to it will be notified and you will be able to review it under 'Related Issues'.