Sales Invoice Item price is plus GST

How do you if you can make the sales invoice item include the GST? So, if my item is $75 instead of me working out the tax that makes up $75 how do I make it so I can just add the $75 in and on the invoice it shows the correct excluding GST amount? I’ve done this on another platform in Odoo just wondering if it can be done on Manager


sorry mate, I finally a found reference to it.