Pretty much the same rules as making any SU model smaller. If it's a repetitive model you can turn geometry into instances of eachother. It depends entirely on what's making the file size so big though. Maybe you can post a screenshot of the model.
-Brodie
Hi,
You can replace a button on a chesterfield sofa by removing the old button-through pulling. Discard it and make a knot of twine on a metal pin. Adjust it on the twine needle and insert it into the sofa. Rotate counterclockwise and remove the twine needle. Install the new button and make knots.
