What is that particular value you want the BU Group to select. ?
May be write like in a trigger -> Actions -> Select in Field -> BU Group
= IF(GetCurrentField(YourGroupName) = 'Ultimate Customer', 'YourBUGroupvalue')
I tried similar in using one of my cyclic group but going different value in cyclic group is not being treated as select or change so trigger-action is not getting associated.
The Cyclic group doesn't show up in fields but I've inline table on which I had created cyclic group. I was using it. Its value does show up in fields section on triggers tab,
Please see screenshots below.
No in document properties. But create a variable first then use variable event trigger on OnChange
LIke create a variable like
vChange = IF(GetCurrentField(Cyclic1) = 'ProblemDetail', 1, 0)
In document properties Triggers tab use like
Change the field names accordingly.