How to get sub totals and grand total in Visual Composer

Dear All,

I have a requirement like displaying a subtotal and grand total based on field choosen.

Now i am able to display total for each line or end of all lines in model or grand total but unable to get subtotal at end of item.

current output:

line item 10

sut total - 50

line item 10

sut total - 50

line item -20

sub total -100

line item -20

sub total -100

expected output

line item 10

sut total - 100

line item -20

sub total -200

grand total - 300

i have tried with group by and calculation we are not able to use both options at a time.

Regards,

Raju