Hi @unnimathew4
There are many varying opinions on what is the right practice in this scenario.
I would recommend investigating the following option and and determine if it suits your project workflow. Essentially in my opinion what you model is what you build.
Copy monitor the structural walls into your model. Then model internal lining walls onto the faces of the structure. Ideally internal linings should be modelled to there built height. Floor to ceiling or floor to soffit for fire/smoke walls etc.
External cladding walls can be built as single walls to the extent of the cladding. With structure being joined to the walls.
Where the architectural walls are independent of the structure they can be modelled as complete walls. Think in terms of wall schedules.
Obviously this does not cover every scenario, but in practice this is how I approach it.
I hope this helps and good luck.
Joe Keogh
Director | Design Technology + Innovation
www.viewlistic.com.au