Clone or apply rule to mere than one group

Hi, i have a FWG+ since few days, so i'm still a noob on firewalla. I'm coming from untangle.

I have 3 kid, 2 younger and one older. For sake of simplicity initially I put all of them in a group called "kids" but very quickly complains arise cause the "time based" rules for the younger are too strict for the old one.

So I split in "young" and "old"... and setup different time rules attached to each group.

95% of the rules are in common, I wondering if there is a way to clone the rules, or, even better, apply the rules to different group. This will make the management easier cause a change will affect all of them.

The other way could be to create a separate vlan for both the group and target that vlan instead of the group level but seems that i'm over complicating a simple home network setup.

any hint or suggestion is appreciated.