I understand that Box for Microsoft Office can be used for co-authoring within a group.
One file contains sales figures and we do not want them to be edited in the tally.
In another file, we want to input/modify the data by 2 or more people.
Is it possible to allow/not allow co-authoring for each folder?
I tried using the “group” setting, but even if I set up one folder (and 4 members), it still participates in co-authoring in no specified folders.
Hi 
Welcome to Box Community!
In general, if you want a file to be editable by only a certain set of users, it would be best to use Box permissions (e.g. viewer vs editor). Also, it shows you’ve already get in touch with one of our Product Supports via support ticket regarding your inquiry about co-authoring for each folder.
For now, please keep an eye out for a follow up from our Support Team for further assistance. 
Meanwhile, you may check these helpful articles related to co-authoring:
Using Microsoft Office Coauthoring Basics Admin Guide for enabling coauthoring in Box for Microsoft Office Support for Box for Microsoft Office Coauthoring
Have a great weekend! 
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