Seperate unique accounts and manipulate data

[blackie42]

Hi

Wonder if anyone has time to help create some code for following..

Need to insert a line after every unique account in column K

Need to change the sign on values in AB where value in O is Sell

Need to sum values in AB for each unique account (in AB where the line was inserted)

Have attached before (sheet1) and after (sheet2) if this helps - just a sample, actual sheet is a lot bigger of course

Be really grateful for any help

thanks
Jon