There is no way to do this within Sage 50.  I have seen some use the job fields but that is a mess with every job being unique.  That does tie the PO's and SO's together so there are some advantages to it.  [email protected] 

We have had clients put the line item due dates at the end of the line description with a consistent structure, i.e., 11/13/23. Then, utilizing a custom report, we can extract those last number of characters to create a new field for our report, and provide you with a report based on due dates, by Vendor, etc. We can't change the programming within Sage 50 to make a new field for this purpose, but we have successfully created various custom reports using this method. Please reach out to us if interested in pursuing this option further, https://pcosupport.com. 

Hi Jesse ... we have had customers put the due date at the end of the description on each line item and then we can create reports by line item due date.  If you'd like to discuss feel free to reach out to us at [email protected] or 800-339-8224.

Thanks ... Tim