Change Position on Posted Requisition

We have a req with applicants that was originally posted with Grade T2. But the hiring team since than decided to change the grade to T1 and we created a new position. I know that the position field is non editable, and I cannot change the grade on req because its linked to the old position.

Is there a way I can change the position and/or grade on this requisition so we don't loose applicants?