Sharepoint online custom action group

Hi,

I tried to add an app with an element having <customactiongroup> but it failed stating it is not defined in the schema and the only option was to add just <customaction>. Is it possible in sharepoint online to add any customactiongroup at all?
My agenda, is to add a set of menu items with location 'EditControlBlock' to a custom group and not use the default group 'Advanced' in sharepoint online. 

Thanks!

Regards
P