For work, in a proposals department using Office 365 on SharePoint, one proposal will require Canadian English rather than our default American. I went to set it, but I do not wish to set it for every Word document I open, which seemed to be indicated.

The online (SharePoint) Word document is made from a copy of a custom template (dotx) that we use. It was in that template, online, that I attempted to make the change, planning then to update the document from that, or create the same proofing setting in it, if that's what's required.

But is this possible? I see the choice of "removing" American English as a proofing language, but don't know what that means with regard to my concerns above. This one proposal is a "one-off" in this regard, though it's possible we'll see others from Canada, but only occasionally.

Thanks.