From CommenceCRM-Help
1. From the Leads module, select the desired lead from the respective lead list. The Lead detail page displays.
2. From the Lead detail page, select Pending Activities from the drop down list in the Related Info section at the bottom of the page.
3. Delete any related activities by selecting the activities and clicking the Delete button.
4. Click the Delete button at the top of the page to delete the lead.
Return to Leads