This last sentence is as important as it is true! Don’t assume all 135 PIC is the same. This is all relevant to what counts towards 121 captain eligibility. If you look that up, you’ll find that it more or less covers flight time where an ATP cert is required. If you have 135 PIC but no ATP, you prob have zero that counts. If you already have an ATP, you prob need to dwell in the meaning of those regs to figure out what counts and what doesn’t.