Hi @pow777777 ,
Could you please share a bit more about your scenario?
Could you please show more details about the Enterprise Custom Field that you mentioned?
Do you want to group up the list of Projects within your Gallery based on a Enterprise Custom Field?
If you want to group up the list of Projects within your Gallery based on a Enterprise Custom Field, I afriad that there is no way to achieve your needs.
Currently, the Enterprise Custom field value could not be returned from the ProjectOnline.ListProjects(...) or ProjectOnline.ListProject(...) function within PowerApps, we could not access it within PowerApps app.
Note: The ProjectOnline.ListProjects(...) function and ProjectOnline.ListProject(...) function have specific returned object rather than dynamic return object. Please refer to here.
If you would like this feature to be added in PowerApps, please consider submit an idea to PowerApps Ideas Forum:
https://powerusers.microsoft.com/t5/Power-Apps-Ideas/idb-p/PowerAppsIdeas
Best regards,