Merge games into one game

Say I have a game

1.e4 e5 ...

and another 

1.e4 d5

How can i merge these two games into one game, were the 

differences will be added as a variation?

like

1. e4 e5 (1..d5) 

I would be very glad when I understood what you ment to say...

According to my dictionary merging is combining ( even gradually ) two things ( two moves here ) so as to become a single thing ( one move ).

Where will the black pawn be placed ? 

This depends on the software used. I use HIARCS, it has a simple "Merge with current game" menu entry.

-Izmet

thank you, the HIARCS program was perfect. I use scid, i wonder if there is an option for that in there...

In Scid:

1. Load the first game
2. Open the game list tab
3. Right click on the game yoy want to merge, and click merge

Thank you very much, 

it works

Also, Chessbase works the same way. But I do not know if merging games is a possibility in Chess.com