Same symbology and color for all attributes of layer in QGIS

Question

In QGIS 3.22.0 (Bialowieza) I have a polygon layer with different attributes.

I'm making a categorized map for each attribute in my table. For that I'm duplicating and renaming my layer corresponding to the attributes I want displayed. All attributes always have the values 0,1,2 or 3. The layers mostly have 2-3 values, but sometimes all 4.

I would like the value to correspond to the same color in each cateogrized map. I thought if I saved the style of the classification I could load it, when I want to display the next attribute. Unfortunately, when I save a style, it saves the value of the attribute with it. Meaning, that when I move on to the next value and load the style, it jumps back to my previous value.

Is there a possibility to save the style and use it for each value?

In the first Image you see my layer with 9 different attributes

For each attribute I would like to create its own map

Since all layers have the values 1,2,3 or 0, I would like all symbols to have the same color through out the 9 maps. Unfortunately I have to manually classify and change the colors of the symbols for every attribute

Answer 1

This is where the feature "Match to Saved Symbols" (and "Match to Symbols from File...") comes in handy.

To use this feature, you need to create styles in the Style Manager that have the same name as the attribute values you want to assign them to. In your case, you need styles called "0", "1", "2", and "3":

You can either create the required styles in the Style Manager, or you can save the styles from the Layer Styling panel:

To apply these styles to your other layers, you select "Advanced"/"Match to Saved Symbols" in each layer's "Layer Styling" panel.

If you want to change the style for one of the values later on, you edit the style in the Style Manager (not in the Layer Styling panel), and then re-run "Match to Saved Symbols" for each of your layers.

Answer 2

It doesn't seem like you need to create a separate shapefile for each attribute. So your attribute table looks like the one below, several attributes all taking values within 0, 1, 2 and 3.

You need first to create a categorized symbology (Properties -> Symbology -> Categorized), use as a "Value" your first attribute ("att_1") and click "Classify" to import all four values (0, 1, 2, 3). That will give you the rendering below.

Then the only thing you need to do is to go back to your "Value" and select the next attribute from the dropdown menu (let's say "att_2") and just click "Apply" at the bottom and it will come up with the map below.

And then repeat the process for each attribute.