I have had a lot of people ask me about the limits for the number of channels / groups / frequencies in the GE / Ericsson / M/A Com / Harris radios. This is the chart from the RPM release notes that outlines those limits.
Keep in mind that these are the physical limits of the radio / software. Your specific radio may be feature limited to lower overall numbers. Popular limits are 64, 128, 255 and MAX SYSGRP. The latter allowing for any number up to the limits in the chart above.