In QGIS 3.16. I have a shapefile (polygon) layer with an attribute table.
What I'd like to do is select certain polygon features and turn them into parts of one multipart polygon feature, without affecting the other, unselected features on my layer. If possible, I'd like to do this
- in a way that allows me to select which of the multiple selected features to keep the attributes from;
- in a way that does not create a new layer each time (I want to do this many times for my layer) but simply collapses the selected features into one line (with the chosen attributes).
If possible, though this is less important, I'd also like to do it:
- by physical selection (clicking) rather than grouping by attribute.
I believe that this is possible in ArcGIS, but in QGIS the existing methods of turning 'features' into 'parts of features' that I am aware of, do not allow one or more of these criteria.
- "Collect geometries" automatically picks one feature from which to pull the attributes that it will assigned to the new, multipart feature (and it creates a new layer).
- "Aggregate" has a range of options for determining the attributes of the new, multipart feature (collect, sum, concatenate...) but as far as I can see it does not allow simply selecting one of the source features for the totality of its attributes. (And it creates a new layer.)
- "Promote to multipart" creates multipart geometry but does not actually turn features into parts of features.
Is there a plugin for this?