Hello Abdul Athar, I'm to understand that you're trying to merge two certification profiles, say Profile A and Profile B. To do this, sign in to Profile A on MS Learn, go to Settings --> Account Management --> Add Account. Now, login with your Profile B account. After merging, only Profile A will exist, combining both profiles' learning history and achievements. You would also want to be aware of the merging logic defined here -- https://learn.microsoft.com/en-us/training/support/faq?pivots=profile#can-i-merge-two-profiles-of-mine-into-one
Please do not forget to "Accept the answer” and “up-vote” wherever the information provided helps you, this can be beneficial to other community members.