Drag the first instance of the property that you want to converge
from the list on the left, and drop it on the appropriate group in the list
on the right. If the group already contains one or more promoted
properties, the new property is added at the end of the group. Rename the
new property if you want to. If you want the promoted property to appear
in a new group, you can either create a new group using the new group icon
above the list on the right before you promote the property, or you can drag
and drop the property into an empty space below the existing groups, which
forces a new group to be created. Rename the group if you choose.
If
you drag the property onto an existing promoted property of a different type,
a no-entry icon is displayed and you cannot drop the property.
You must create this as a new promoted property, or drop it onto a compatible
existing promoted property. Properties must be associated with the same property
editor to be compatible. For example, if you are using built-in nodes, you
can only converge like properties (string with string, boolean with boolean).