You select an Auto Cylinder feature.
You select the Position symbol 
for your Feature Control
Frame (FCF).
From the from the GD&T standard list, you choose ISO 1101.
The local size is measured where you take the hits at each level of the Auto Cylinder along its axis. You should take hits on more than two levels when you evaluate the local size.
The Local size list on the Feature Control Frame tab in the XactMeasure GD&T dialog box (Insert | Dimension | <dimension>) defines the type of local size options to use. This list appears only if you meet the following conditions:
You select an Auto Cylinder feature.
You select the Position symbol for your Feature Control
Frame (FCF).
From the from the GD&T standard list, you choose ISO 1101.
The Local size list contains these options:
NONE - No local size is reported.
LOCAL: MAX & MIN - This reports the largest (MAX) and smallest (MIN) local sizes from all the levels measured along the axis of the Auto Cylinder.