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Filtering CMS items based on current item view

I’m having a particularly vexing problem on one of my projects. The website uses CMS and the items are all tagged with a typology in the database. I would like to filter the “Similar Projects” navigation links within each project (The last 3 column grid before the sign up forms) to filter projects based on the current view. For example, if you’re in an item tagged as residential, the similar projects menu should filter links for only similar residential projects. I know this requires custom code but I don’t know where to find the documentation to experiment wiith. Can anyone help?

Here is my public share link: Webflow - FeetInch Studio