On page 178 of AF 5000 instillation manual v15.1 altimeter check.

How do you get to the EFIS calibration menus #2 for altimeter? Pictures show only airspeed, and on page 174 shows altimeter as #3.
My issue is my indicated altitude at cruise (8500ft) is reported by ATC to be 200 feet high or 8700 feet by what is being sent to ATC. I have a Garmin 430 W and ADS B in and out. My altitude on the ground is very accurate within 20 feet on local altimeter.
Once on the EFIS calibration menu can I correct for altitude error at cruise altitude and not effect altitude static on the ground?