I'm using QGIS 3.14 Pi and here's my scenario. I have a layer of points and each points contain a numerical value
code, let's say it's
123. There may be multiple points with the same
code value. In another layer, I have polygons, each with a unique
code. What I want to do is select (click on) a point and have the polygon in another layer with the matching code value select also. The points may or may not be inside the polygon.
Many years ago in MapInfo I had an MBX that would do this, so I imagine there's a QGIS plugin that would do the same, I just don't know what to call it.