Hy,
I would like to group tickets via stucture, but don't group some 
My tickets :
TA1 (labels : empty ; project : "Project A")
TA2 (labels : empty ; project : "Project A")
TA3 (labels : empty ; project : "Project A")
TA4 (labels : "Lab" ; project : "Project A")
TB1 (labels : empty ; project : "Project A")
TB2 (labels : empty ; project : "Project A")
TB3 (labels : empty ; project : "Project A")
TB4 (labels : "Lab" ; project : "Project A")
My result adding automation group by project + group by attribute and formula (labels.FILTER($ = "Lab")) :
Project A
-No value
--TA1 (labels : empty ; project : "Project A")
--TA2 (labels : empty ; project : "Project A")
--TA3 (labels : empty ; project : "Project A")
-Lab
--TA4 (labels : "Lab" ; project : "Project A")
Project B
-No value
--TB1 (labels : empty ; project : "Project A")
--TB2 (labels : empty ; project : "Project A")
--TB3 (labels : empty ; project : "Project A")
-Lab
--TB4 (labels : "Lab" ; project : "Project A")
My need :
Project A
-TA1 (labels : empty ; project : "Project A")
-TA2 (labels : empty ; project : "Project A")
-TA3 (labels : empty ; project : "Project A")
-Lab
--TA4 (labels : "Lab" ; project : "Project A")
Project B
-TB1 (labels : empty ; project : "Project A")
-TB2 (labels : empty ; project : "Project A")
-TB3 (labels : empty ; project : "Project A")
-Lab
--TB4 (labels : "Lab" ; project : "Project A")
Thanks a lot for your help !!