To replace an item in its current cBOM context, you must first check out the parent item in order to maintain the relationship between the child and parent.
Open the assembly containing the item to be replaced in your CAD software.
Refresh the cBOM view. Ensure the parent items of the item to be replaced are checked out.
Right-click the item you want to replace and select Copy.
Select the items you wish to replace.
Click Replace.
Refresh the cBOM view.
Right-click the parent item and select Check in (or Save).
In the CAD Check in window, click OK.
The new item is created and replaces the original item in the cBOM.