Yes and no, they have a station with Minifigure parts that technically let's you make a figure. That being said you cannot use custom pieces and are limited to their selection of parts in store.
To add to Zalabar and Keith's comments - also keep in mind that there is only one bin in the store and so it's usually crowded with kids and may be difficult to get in and find what you are looking for.
Just to add its a mess. No real organization to the pieces parts. Heads, hats, bodies, accessories are all in the same bin.
what zalabar stated..
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