Code: result = df.groupby(["customer_ID","entry time"])[“Tag1", “Tag2”,"Tag3”,"Tag4”,"Tag4”,"Tag5”,"Tag6”,"Tag7”,"Tag8”].sum().reset_index()

Code : result = df.groupby(["customer_ID","entry time”,"gender", "age","location", "country", "exit time", "value 1", "value 2"
 ])[“Tag1",“Tag2”,"Tag3”,"Tag4”,"Tag4”,"Tag5”,"Tag6”,"Tag7”,"Tag8”].sum().reset_index()