How to track investment account perfomance without inputing individual trades

Hi.

I haven’t figured out a good system how to track a investment account as a whole without entering each trade.
On the account I make trades, some are loss, some are win. I don’t want to enter each trade one by one. Its ok for me to adjust the balance one a month or so but I want to track capital gains/loss.
I’ve “played” with the price of unit but this gets messy once I add or whithdraw funds.

Any idea?

BR,
Lauri