combo box, linked

i really need help in decision here. Now i have a large excel worsheet which contains something like a database of products. So now what i need to do is to create a user friently interface. Ok, in this interface, the user will have a combobox with the list of products and each product may have more than one sizes. For each of this sizes there will be information like price and expiry date,etc...

so my plan is to create a combobox for the product and then another combobox for the sizes that links to the products combobox. So i really dont know how to do this using excel macro userform or in the worksheet itself. I dont want to use access as im not that good at it compared to using excel. Ok so when i press the search button for the products i want the other combobox containing the sizes to display the list of sizes and when i click the Display button after chossing the size, i want the information to be displayed in the following text boxes.

so the main problem here is to add the list to the combo box from another worksheet and to link the combobox.

hope anyone can help....very much appreciated

once the product is selected in the Products combo clear the sizes combo (cboSizes.Clear),
loop through the Range of sizes of the selected Product in the XL sheet and load each size into the combo using cboSizes.AddItem method.
When a size is selected in the sizes combo find the right data row and display the data in the text boxes.

Another option would be to load the sizes into a list control (as apposed to a combo box) and display the data when the user selects a size from that list.