The blank master sheet which is pretty much perfect now after...

The blank master sheet which is pretty much perfect now after one hell of a lot of time and effort by a friend and myself. Neither of us are pro spreadsheet users so I am pretty happy with it. The one thing I cannot work out is how to include split trades. The way I have been doing it is to say with OVL today I had tripled my money but could not work out a way to sell just enough to be free carried. I had to sell the lot and enter a new trade at zero cost which pretty much stuffs up the percentages etc.
Anybody able to help with this would be much appreciated. Rob you still around?
JUst yell if anyone wants a copy of the master sheet, cheers,
Rick