Hello @esedege. As I feverishly assemble my blog site and knowing I have blog posts that are tied to what you call mulitple “subjects”, the approach I am thinking of taking is duplicating the blog posts and placing them into their appropriate blog post section.
I see Sparkle’s section function as a way to have a collection of blog posts where the collection is a “subject”. This allows me to take advantage of Sparkle’s ability to generate a separate index for each subject. While far from ideal, I don’t see me updating a blog post too often which means once I create a blog post, I am duplicating it one time.