Hello,

I am developing a process / workflow where resources listed in List A are reduced by an amount listed on List B. The form for List B needs to show the number from a column within List A. The user then selects or inputs an amount less than that number and submits. The form starts the workflow which when approved reduces the amount defined on the List B form from List A. 

Please help me, if there are questions, let me know.  (SharePoint 2013, Nintex 2013 on-prem)