In Ecwid, you can create different product variations by means of product options
and product combinations
. However, it is currently not possible to make some options to be available or unavailable depending on previously selected ones, like you suggested. There is a related suggestion in our ideas base though:
Please vote for it if you find it useful.
If you need help with development of such a mod for your Ecwid store, our colleagues from Qualiteam will be glad to help you. If you are interested in it, please contact them at email@example.com