Delete Hard Coded Columns after PowerQuery GroupBy

Hello Everyone, 

Down below I've shared my groupby statement. 

In PowerQuery M this is the code:

#"Groupby Casenummer for min_wo" = Table.Group(#"Type to date", {"CaseNumber"}, {{"Min Werkordernummer", each List.Min([wo_number]), type nullable text}, {"ALL", each _, type table [Id=text, CaseNumber=nullable number, AccountId=nullable text, AssetId=nullable text, Type=nullable text, RecordTypeId=nullable text, Status=nullable text, IsClosed=logical, ClosedDate=nullable datetime, OwnerId=text, CreatedDate=datetime, Company_name__c=nullable text, Serienummer__c=nullable text, wo_serial=nullable text, wo_cause=nullable text, wo_dateofvisit=nullable date, wo_downtime=nullable logical, wo_endtime=nullable datetime, wo_starttime=nullable datetime, wo_number=nullable text, wo_enddate=nullable date, wo_startdate=nullable date]}})

I want to make the last line of the code dynamic, because if I add a column in an earlier step, I need to manually do the GroupBy everytime. 

Last line (copied from whole statement above):

{"ALL", each _, type table [Id=text, CaseNumber=nullable number, AccountId=nullable text, AssetId=nullable text, Type=nullable text, RecordTypeId=nullable text, Status=nullable text, IsClosed=logical, ClosedDate=nullable datetime, OwnerId=text, CreatedDate=datetime, Company_name__c=nullable text, Serienummer__c=nullable text, wo_serial=nullable text, wo_cause=nullable text, wo_dateofvisit=nullable date, wo_downtime=nullable logical, wo_endtime=nullable datetime, wo_starttime=nullable datetime, wo_number=nullable text, wo_enddate=nullable date, wo_startdate=nullable date]}})

Is there anyone who can help me with this one?

Thanks!