VA Outline groups items together with a parent node when there are several similar items in a row. For methods, if you have several class member methods in a row, then they will all be grouped together under the "CLASS_NAME methods" parent node. This is helpful if you have methods from more than one class in the same cpp file.
If you want more direct control, if you right click in VA Outline and make sure you have "Display Regions" turned On.
In C++ you can introduce a region like this:
#pragma region PRAGMA_REGION
static void functionInsidePragmaRegion() { }
static int secondFunctionInsidePragmaRegion() { return -1; }
#pragma endregion PRAGMA_REGION
both functions will be shown with the region parent node.
If you want to add regions into VA Outline easily, select one or more entries in VA Outline, then:
Right click -> Surround With -> #pragma region ... #pragma endregion
to surround them. You will then be prompted to name the region, since a region without a name is a lot less informative than a region with a name.
If you are using regions you can also collapse them in the editor, via the "Edit menu -> Outlining" commands.