Hi Matheus,
You need to activate business function to do mass change for do not execute
Processing Orders Collectively - Orders (CS-SE/PM-WOC-MO) - SAP Library
You need to contact your IT team to activate the same.
In other way a simple LSMW or BDC program needs to be created and you can execute this when ever you want to do mass change. Contact your IT team.
Regards
Terence