Im working on an article and its getting really big, on this article I address more than one subject, and the subjects depend on previous subjects. Instead of posting one big article, Can I split the article in multiple parts?
of course you can, it has been done many times. Here[^] is one example.
There may be some tricky things about it, such as providing a download for each of the parts (you can't expect to have only one download, with the last part); and providing an overall table of contents (more content increases the need for a TOC). And it helps when you know how many parts there's going to be, so you can title them "ZZZ (part X of Y)".
So most of the time I expect it boils down to writing all parts before publishing any of them. But even that is not a must.