Counter groups are useful to categorize and organize your counters. The effects of placing counters into groups are observed in analysis.
The path structure separated by a '/' will nest your counters in the Analysis tools.

The example above will be structured in Analysis as:

If counters are not nested and there are two counters by the same name on two different equipment items, the duplicate will be renamed in analysis.
Example: Outfeed will be renamed as Outfeed(1) if another counter in the same path has Outfeed as the name.
Related Documentation
MES Equipment Manager | Perspective
MES Analysis Selector - Perspective
MES Counters