Adding or omitting Tasbeehaat when performing Salsatut Tasbeeh

Q: Salaah-135: Will Sajdah Sahw be necessary if one added or omitted any Tasbeehaat when performing Salaatut Tasbeeh? If Sajdah Sahw is necessary. must the Tasbeeh be recited in it?

Answer: Sajdah Sahw will not be necessary in the stated case. If any of the Tasbeehaat are omitted in a posture, it should be recited in the following posture.
However, the Tasbeehaat omitted in Ruku must not be recited in Qaumah but in the first Sajdah thereafter. Similarly, the Tasbeehaat omitted in Sajdah must not be recited in Jalsah but in the Sajdah thereafter because Qaumah and Jalsah are short postures and it will be wrong to prolong them. Each Rakaah should have seventy-five Tasbeehaat and no less.

Fatawa Rahimiyyah vol.2