Same need at Contacts section. when creating task for the contact, task should include from the beginning, or allow to add all deals that he/she is involved in, so it appears on each of the deal's timeline.
You can create tasks for multiple deals if you navigate to the Deals page in your portal. From here, select the Deals you'd like to create tasks for and then click the Create Task button. This will create a task for each of the deals you selected.
