Link to product page with option selected.

I am hoping to find a coding option to link to a specific product page with one of my product options already selected.

for example: Tee shirt with options red, blue, and white. and sizing options
on separate page a button linking to tee-shirt, with option blue already selected so the costumer doesn’t have to re-select that option…
same with the other colors…

You would have to create unique URLs: for your dynamic pages https://support.wix.com/en/article/creating-a-unique-dynamic-page-url

and then link your button to the specific dynamic page including parameters to your url in wixLocation :

https://www.wix.com/corvid/forum/community-discussion/how-can-i-link-a-dropdown-user-input-element-to-a-dynamic-page

See an example here (not a code that you can just copy and use in your case but something that can give you an idea on how to include parameters):
https://www.wix.com/corvid/forum/main/comment/5d4abb3f801f3900170a5a02

Good luck!