Offset debits and credits - p/o

Hello,


I have an excel spreadsheet with debits and credits I have to manually offset. I have attached my document

What I would like to do is if a p/o (column H) has an offsetting debit and credit, or that same p/o has multiple debits and credits that offset-----> highlight these lines one colour

It gets tricky in that the following criteria should be met, If the p/o has a remaining amount on it, that remaining amount should be from the last TRX Date (the most recent date row should remain on the spreadsheet).
(please see offset spreadsheet and disregard accrued pop)
If possible these remaining lines should be highlighted another colour

I'm looking for a formula that can help me with this.

Thank you very much