Hi @Anonymous ,
Is this what you want?

Here is the code i put in Onselect event:
ClearCollect( Expense,
{ Category: "Learn", Price: 8615000},
{ Category: "Bills", Price: 3562000},
{ Category: "Travel", Price: 3165000},
{ Category: "Books", Price: 2874000},
{ Category: "Learn", Price: 2273000},
{ Category: "Bills", Price: 1760000},
{ Category: "Travel", Price: 1602000},
{ Category: "Bills", Price: 1494000},
{ Category: "Books", Price: 1344000}
);
ClearCollect(GroupExpense, GroupBy(Expense,"Category","Prices"));
ClearCollect(SumByCate, AddColumns(GroupExpense, "Total Amount", Sum(Prices,Price)));