problem with Total Amount

Hello everybody
I have a question about Total Amount . when I use a “radio button select” for a category of products and then “Total amount lable” then it works perfect. Now, I would like to add another category of services (another “radio button selections”) below the first one. this is because our customers want to but one thing from the first category and another thing from the second category. In this case the “total amount lable” must shows what it is chosen in the first category (fist radio button selections) PLUS what is chosen in the second category (second radio button selections), right? But it doesn’t. The Total Amount lable still only shows the total of the first radio button selections. please advice. how can i add these two categories? is Total Amount label working as it should? thank you for your help.

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