Formula needed to return multiple results based on one reference

Must say that I've browsed this forum for quite some time and loved it so much I registered in the event I could help somebody out (hasn't happened yet) or my fear...I needed help.

Well like many posts have started out...I've searched, read, searched, read, and still cannot find something close enough to my need so here goes my first post.

The attachment is setup as such:

Sheet "Main" has the following:

ITEMS in cells A2:A16
ORDER #'s in cells B2:B16
TOTAL QTY in cells C2:C16

Sheet "Data" has the raw reporting sales order data, hypothetically extracted from our company database.
Items in column A, Order # in column B for items, and qty per item/order# in column C.

On the Main sheet I have used the "sumif" formula to calculate the total qty on order for the referenced item, no issues. How in the world can I use VLOOKUP, or something similar to report back (Column B is my intention) each individual ORDER #?

So if I have Toys on order #'s 1,2, and 3...I would like to see it show "1, 2, 3"

Please help!