How to create a flexfield where you can select inactive positions

Content

Hello,

We are in the process of enabling the functionality for managers to request a position in Fusion. 

My Team> Request a Position

Within the questionnaire UI I want to be able to enable a flexfield under Budget which allows a manager to select an inactive position as the current 'Funding Position' flexfield only brings up active positions.  Does anyone know how to do this?

Please  see snippet attached.