Can I import my tee shirt designs from my website?

Hi, good question.  It depends on your existing website.  Can you export all the images from your website to a folder on your PC?  If so, then you can use the Tshirtgang Bulk Upload tool.  Instructions are on this page.  If it gets a little technical renaming the images as per the instructions, this is something that http://tshirtdesignservices.com can do for you as a “Special Project” (choose that option when creating your project request).
Cheers,
Steve