To extend the validity of a related document, you must follow the following instructions:
Go to the main menu of the platform on the left side and click on documents.
Select the document you want to extend its validity to, which must be related to be able to extend its validity using the date of the other document.
Click the red (expired) or yellow (expiring) icon next to the document name.
A pop-up window will open with two options, extend or terminate.
Click extend in the dialog box.
In the validity modifier, select the expiration date of the related document.
Click save and the document will be saved and extended with the expiration date of the related document.