No, we don’t support running a “partially” static website.
Simply Static will convert your entire website into a static one, and while we do offer Single exports to export specific pages/posts, this is aimed to be used to quickly update/push new content to your existing (and fully) static website.
You can use iFrames to embed certain dynamic features from your WordPress website into your static website, but your WordPress website would need to be accessible from the internet to make that work.
However, using iFrames isn’t recommended for things like WooCommerce. You should only use it to embed 1-2 pages that require dynamic functionality (booking systems, unsupported form plugins..) into your static site.