This is absolutely wrong practice.
1. PIERS
Assign as per option a (See image posted by sir Makhzumi in previous reply)
Why didn't you apply pier to spandrels. Most people do not apply piers labels to spandrels. Give up on that.
Lets talk about this image. The top floor. Piers go horizontal with same number. 2 shells of P3, 2 shells of P2 and 2 shells of S1 should all have been defined as one pier.
Then P2 and P3 slender piers below them should be assigned different pier names separately.
Infact, as flexural deformations are dominant in these slender piers, divide them (mesh) into 4 pieces and assigned different pier to top 2 shells and different to bottom 2 shells (depends on the moment diagram though).
2. SPANDRELS
Assign as per option a (See image posted by sir Makhzumi in previous reply)
The spandrel I see in image is a deep beam. Isn't it? L/D < 4? If so, where is the meshing?
If its not a deep beam then apply different spandrel labels to each shell atleast in the middle for postive moment design.