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So far i know, All you have to do is, to take core samples and evaluate it strength. On the bases of these results you can do assessment of the existing structure in SAP2000.

Yes you have to scale down as per 1631.5.4 (screenshot attached).

If you are doing it for the first time i would recommend you do the PT design manually to understand the behaviour of the forces first as the stresses equivalisation in the slab is important. you can deal wth the column strips individually. The diaphragm reinforcement interaction with the PT alos needs to be looked in detail. So that the location of reinfrocement is right. u would suggest use PCI manual for the basic design. Maybe someone else give you a hint on ETABs but i belive if you are doing something new in software than there are alots of variable which you can comprehend in the first analysis. I hope it helps a little.

If you are a starter use this link. https://www.csiamerica.com/products/etabs/watch-and-learn