Inside Coach Catalyst on the client dashboard, you can complete many BULK actions by checking the box in front of 'name' or in front of any client's name.
Once you check the box, you will want to select Assign to Global Elements:
Select the element you want to add:
Once you select the element type: message, lesson, workout, action, or form, you will have the choose one from global elements. This means you will have to have this element created before assigning it to clients.
Select the start date and then Assign to Element.