Can I delete a Pooled Position that was created but no longer needed?

Yes, CalPlanning users with the Planner role can delete a Pooled Position in HCP that is no longer needed for any period in which you are currently creating budgets.

From the Create and Manage Pooled Positions form, right-click on the cell containing the Pooled Position you would like to delete, select Manage Pooled Positon -->Delete Pooled Position Monthly Pay Rate.