Add a fixed amount to your winnings

[biggetje]

Is there a way to add a fixed amount to your winnings?

I lost a couple of hand histories and I don't know exactly when I played those hands, all I know is how much I won/lost during that session because I keep my results in an Excel sheet. I would like to add this amount to my graph, but I don't know how.

Any help is appreciated.

[udbrky]

You can add the net as a bonus.