From the DX1 dashboard click on Inventory Management 

Search for the part number that needs to be superseded. 

On the left hand side of the Inventory Item Detail screen under the Brand box is the Supersedes To box. 

 Enter in the superseded part number and choose from the drop down 

Click the Save button in the upper right hand corner. 

When the original part number is now added to a new parts invoice the user will be able to choose either the old or new superseded part number. Place a check mark in the box next to the part number to be sold then click the Add Selected button.