How to clone or copy the value of a custom field group picker (single selection) in automation?

[Sofia Grunspan]

I have an automation rule that clones an issue and links to another and copies the values of certain fields, but the value of a custom field type group picker (single selection) is not being copied.
I've tried this rule cloning and linking issues in the same project or in different ones, but none of the worked.
I've tried JSon
{
"update": {
"customfield_10000": [{ "add": { "name":"group-name" } }]
}
}
Or creating variables and didn't work either. Please can you help me? Thanks

[Stefan Salzl]

Hi @Sofia Grunspan 

Could you describe this in more details? From which issue would you like to copy the custom field? 

As far as I can see from your rule there is only the trigger issue and the cloned issue. If you clone the trigger issue the group picker field will be copied/cloned anyways.

Please let me know if I got something wrong here.

Best
Stefan