Add New Activities to a Cost Estimate Add an activity to a cost estimate. These can be organized into hierarchy or cost breakdown structures. To add new activities to a cost estimate, complete the following steps: Select the S1 // Projects tab. In the Projects pane, select the cost estimate to which you want to add an activity. Complete one of the following actions: In the Editing menu, click Add Activity. Right-click any row in the Activities view and click Add Activity. Parent Topic: Cost Estimate Procedures