Thanks everyone for their responses. 

Spent quite some time reading on posts related to Overlays, BPCU, Developer 
Studio 7.6.04, etc...and trying to understand what all it means and implies.
Here's the situation I am in now(lil' confused), need some advise from 
experts in here:
As mentioned in the original post - *[While running the upgrade installer 
to v7.6.04(from v7.1), we had to delete User and Group forms(without this 
step upg installer was failing) and installer recreated them again. During 
this process we lost customizations to User & Group form(s).]*
-User form - recreated by Installer OOTB - converted to overlay - added 
custom fields...done.
-Customizations - We had some customizations around user onboarding process 
which uses Outer Join between SHR:People and 
User(SHRCFG:OuterJoinPeopleUser). It appeared to be that this form was part 
of OOTB Remedy in version 5 and in my company, we heavily used this form 
for customizations and created customer user onboarding process. But looks 
like in later versions on Remedy BMC dropped this join form.
In short, I am on ARS v7.6.04 with User, SHR:People and 
SHRCFG:OuterJoinPeopleUser as Overlays and some workflow which I had to 
modify and re-import/modify as Overlays.(Manually created overlays)

Based on the above info, I have couple of questions:
1. Upgrade to ARS v8.1. Is it ok to upgrade to ARS v8.1 with only the above 
listed forms/workflow as Overlays and rest all are still as 
Base(Customization Type - Unmodified). As BMC recommends to convert either 
into Overlays or Custom objects(Ideally). But read some posts where folks 
encountered issues while using BPCU and had to do manual rework later on. 
Basically, would like to avoid these issues and manual work and hence do 
not want to run BPCU/or convert into Overlays or Custom objects.
Did anyone had the same situation where only few objects you converted to 
Overlays & Custom but most you left to Base(Unmodified) and have gone 
through successful upgrade to ARS v8.1(or 8.0, etc)
2. Future Customizations: Now since I have mix of objects some are Overlays 
and most are still Base(Unmodified), how to decide to do custom development 
going forward. So e.g., If customization is needed later on - add some 
workflow to join form SHRCFG:OuterJoinPeopleUser(Overlaid) - it is not 
available in Base Development Mode(BD) so do I just do it in Best Practice 
Customization(BPC) Mode or convert it from Overlay to Base and go to BD 
mode and then do development. So,basically it is kind of challenge to 
juggle between Base Development Mode and Best Practice Customization mode 
to do development for a same feature.

Sorry for the long post, still trying to understand on Overlays...

Please advise.
Regards,
Raj

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