Joining 2 Separate Lists Into a third List

hi,

i am Using SharePoint Online 

I have 3 SharePoint Online lists :

1. List A

2. List B

3. List C

List A and List B are 2 separate Lists then do not have any lookup column Connecting them.

I want to merge theses 2 Lists data into a third List(List C)

can u please help me ?

thanks ,

Syed Shadab Mohammed