Kindly reference the following links:
Umrah for deceased | Assim Al Hakeem
Hajj Badal: Is the Talbiya different? | Assim Al Hakeem
Should we say the intention(Niyyah) for Umrah & Hajj verbally or make it in our heart?
Can i perform my first hajj on behalf of other relative ? | Sheikh Assim al Hakeem
Umrah with the intention of Two people & Doing Umrah on behalf of person who's alive
Related: Can a Smoker perform hajj on behalf of the deceased? | Sheikh Assim Al Hakeem