I believe that you are asking “How do I know the effect of an adjustment will be on my position?” And if I can add to that, the next question might be “How can I track my P/L after adjustments?”
Try watching this video https://www.youtube.com/watch?v=rtrCmZVaMGc. It will show how you can keep track of the profit and loss of your trade campaign.
Once you understand this, what you’ll do is put your trade for the initial position in the analyze tab and then analyze your potential adjustment against the original position. If you need more help please post this question for an Options Trading For Income Meeting or a GO Ask a Trader Meeting and I can show an example.