Hi Vaibhav,
Talent Management / Succession Planning uses the CP object and not the P object. And for these infotypes you cannot maintain them in the backend even for CP object, except in transaction HRTMC_PPOM (for some 74xx infotypes, but not all). The infotypres are maintained through Web Dynpro Applications or through SAP Talent Visualization by Nakisa (STVN).
Best regards,
Luke