Carla,
You need to create a new campaign called "Marketing Suspended" and fill in the Description area so Sales will see what this is about.
Smart List = Trigger Campaign Is Requested IS "Sales Insight"
Flow: Change Data Value IS Marketing Suspended IS "True"
if you want this to be temporary, add a Wait Step:
Wait Step: 2 Weeks
Change Data Value IS Marketing Suspended IS "False"
Activate this campaign.
Go into SFDC and Sales Insight on a Lead Record and you will see this as an option under "Add to Campaign"