Hi, now I'm using 0.009 strings and when I play songs with FACGCE tuning (low to high), I tune to EG#BF#BD# and put a capo on first fret because I don't want to buy 0.008. Can I calibrate my guitar to afford 0.010 strings and then put 0.009 on the 6th and 2nd strings to tune up to F and C?
You can absolutely mix and match strings from differently sized sets without much of a problem. You want to make sure that your string tension is relatively normal and there are calculators for that (http://www.stringtensionpro.com/, shoot for between 14 and 18 lbs for each string). You may also have to adjust the intonation for your new strings, but your neck tension will probably be fine.
flakeoff101 Thank you!