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I am not sure if I fully understand your question about this.
If you are looking for a way to divide the parts of a payment tool, and have other fields shown in between, I'm afraid that it is not possible at the moment. The PayPal Pro payment tool is a single field, and as such, the parts that present products, the part about total price, and the part about collecting billing address are all parts of a single field and can't be split further apart.
If you are only looking for a way to change a little of their styling, such as the kind of line that separates these parts, that is possible with custom CSS.
So splitting them apart is not possible, but if you need help with styling them so that they appear separated or connected, we can help. You will need to describe in what way you wish to style them, and we will be happy to look for possible solutions.
I hope this helps.