Hi @dwils the way to go here would be reserving negative quantities. 

See what IFS Clouds Docs explain:

Un-reserve Material Requisition

Explanation

This activity is used to un-reserve material in a material requisition. This is done by reserving a negative quantity. If all previously reserved parts in a requisition line are un-reserved, the requisition line status will be set back to Released.

Prerequisites

The requisition line(s) to be un-reserved must have been reserved.

System Effects

As a result of this activity:

• Reserved parts will get un-reserved and the reserved quantity displayed on the requisition line will get updated accordingly.
• The line status is updated from Reserved to Released, if all the parts in a requisition line are un-reserved.

reserving negative qty’s worked, greatly appreciated.

Is there any way to unreserve multiple lines at the same time?

Hi Mmoss, 

I have found that if you got the ‘Maintenance Material Requisition Lines’ screen and query for Planned and Released line where QTY Reserved is >0 you can highlight all rows and unreserve. We have set up a lobby just for this as once an inventory part has been reserved you cannot change its location .

@hburkett, Yes, the functionality exists for MMR but not the standard MR.