Changing or Removing References To change or remove a reference: Check out the parent file. On the Contains tab, click Custom References . In the Edit User-Defined File References dialog box, do one of the following: To remove a reference, clear Referenced. To change whether a referenced file is in the BOM, select or clear Show in Bill of Materials. To modify the quantity associated with a referenced file, change the value in the Quantity column. Click OK. Check in the parent file. Parent topicCreating and Removing File References