Post CTS analysis without creating clock tree in innovus

Hello,

I'm working on a very small block in which I would like to design "clock tree" (a couple of buffers) manually as it is really important for me to maintain symmetry and balance between several branches. I decided to go for manual design because I did not manage to constrain ccopt to do what I wanted.

Is it possible to make post CTS analysis without explicitly creating clock tree in innovus? I noticed that even if I do post route analysis, delays of the pre-placed cells on clock signals are not taken into account if ccopt was not launched. The only solution which I found so far is to generate sdf timing file and do a transient simulation. Could you recommend any trick or workaround which would allow me to do STA in innovus?

Best regards,
Szymon