Simple trading spreadsheet needed

[Tibi86]

I am particularly interested in one kind of pre-game trading spreadsheet which I will try to describe here.

Lets say it is a basketball game and I evaluate that it worths to bet on Team-A if it has odds higher than 1,50. I check the market and see that its odds at the moment are 1,55. So I back Team-A @1,55 with a 10$ stake.

After this I want my application to lay Team-A @1,49. Application must bet exactly such amount of money that my liability is still 10$ (meaning I lose 10$ if Team-A wins).

If the previous bet was matched, application will back Team-A @1,50 again (my liability will be 10$ again, meaning I will lose 10$ if Team-B wins)...

And it will repeat these 2 operations until the game starts.

Basically, I want to find a value bet, put my money on it, and then to trade between two chosen odds (1,49 and 1,50 in this case) with given liability (10$ in this case).

Can someone please make this simple spreadsheet for me?

Thank you in advance!