Okay, try this:
Note how many rows and columns you're copying in Excel. Before pasting, select the same number of rows and columns in your Word table, then paste -- normal paste. If you have, for instance, $95.00 in one cell adn $43,945 in another, the first, when pasted, will have 4 more spaces between the $ and the number, so that the $ will all align and the numbers will all align at right.

Is this what you need?