Family Potential Grouping

No, I'm not aware of any special syntax required. I usually use numbers (integers) for the group names. I just did a test where I only specified a group name for the connection points sharing potential and left the rest blank and it worked fine: I assigned a wire number to one wire and could Duplicate it on the other. Perhaps you need to use Update Family?

Is there a limitation to the child symbols or the # of connection points on a child symbol?

I also did a quick sample test with a parent coil, child NO contact, and child NC contact (like a form C relay). This worked perfectly and wire number could be duplicated.

When I try this on a much larger family, it fails to work. In this particular case this is for an interface board with 8 children, some of which have up to 15 connection points.

There is not a hard limit to the family in general. From what I recall, the values for the family are stored in a database field, so there is a limit to the total amount of characters the entire thing can take up. So the longer the symbol names are, the more CP text there is, etc. would have an overall effect on how large the family could be before you would hit that limit. I know of cases where there have been at least a hundred children in a single family.

I figured out the issue. One of my symbols must have been created from a similar symbol in which connection points 1-13 had sequential numbers (in symbol creation) of 1, 2, 3, 4, 7, 8, 9, 10, 11, 12, 13, 14, 15 probably because 5 & 6 were removed. I fixed the symbol, and the potential grouping works now.