How to calculate SUM Group set up by Page

[Noah]

Hi everyone,

I'm having trouble with my report about sum group (see my idea in Attach files). I read many topic but i can't done it. How can I sum in one page and move that to next page (Exp: Group is overall show in 3 page.) ? It very difficult with me and I hope someone can help me. 

Thank you!

[Noah]

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