Easy answer to this. Don’t!!!

The airline will want to see the source document (I.e. your HARM records). Each airline asks for your hours slightly differently. The easy way is to take your most recent flight summary and use those hours. No airline will count any “Other” time and copilot time is also not PIC time. You will hear a lot of different approaches to how you should reduce your “aircraft commander” time to account for flights with IPs or dual AC flights. There really isn’t a need to do this. Simply add up all your flight time since you were qualified to hold the A code (less any Other time logged), that is your PIC time. When you go in for the interview place a cover sheet explaining how the numbers on your flight summary became the numbers on the application. You probably won’t get any questions. If you do, you simply point to where the numbers came from in your official records. There are certainly some very nice products to make your records look “civilian” and your wallet thinner, but they can’t beat the actual records.