Resize Artwork in Illustrator
Taking some of the lessons you have already learned previously, you are only a step away from resizing artwork in Illustrator. Since you have a good vector file, now to resize is as easy as entering a dimension.
Once you have your file open, hit Alt + 0 on PC or ⌘ + 0 on Mac to bring the artwork to front and center. Hit Ctrl + A on PC or ⌘ + A to select all the art in your file. Look in the top bar or Transform window and you'll see the width and height of your selection.
To resize to a new dimensions, with the Constraint Width and Height Proportions link clicked, enter a new height or width dimension and hit enter which will then scale your image proportionally.
If you unclick or break the link of the Constraint Width and Height Proportions button, you can enter your dimensions independently.
Resize Artwork for ASI Order
Now that you can resize artwork, you now need to resize the artboard to fit the art as well. For ASI orders since they have Max Imprint Dimensions it is best to just key these in manually. In this case the max imprint is 3.25" x 1" with the Proportions Unlocked key in your dimensions that will then crop your artboard.
You can then easily save as a .pdf to email to a vendor.