Hii
Can anyone tell me how interface mechanism and approve function work when I make interface of one token contract in another to transfer it in 2nd contract...

The interface is basically used to tell the calling contract what functionality the other contract supports. So you create a reference to the other contract based on the interface. In your case, the interface should probably contain at least the approve function

Actually I successfully made interface and also made object in 2nd contract too

But I unable to get transfer functionality in my 2nd contract via interface as I done approve manually too

?

That's not a real question. You're not saying anything what is wrong or what you have tried and so on

What I tried is I made one token contract and one others contract

So token contract is 1 and other contract is 2

So now I made code to transfer 1st token via interface in 2nd contract but I unable to do that

I done approve mechanism manually also

?

You are using transferFrom right?

Yes

Any specific errors

Whenever I do transaction it get fail

I approved 2nd contract and owner of 2nd contract via 1st contract

Still transaction get fail