As you can see below I have 11 polygons in one shapefile, so in the attribute table there are 11 features.
As they all have the same attribute, is it possible to merge them into one feature in QGIS?
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If you wnat keep any other features in the layer (besides theese in your example) single, you can select required features and perform Merge Selected Features in editing. This option is in Advanced Digitizing Toolbar, you can activate it in menu View --> Toolbars