Set a range from the end of the range of the first bookmark to the start of
the range of the second bookmark using .Start and .End
Overwrite that range with ExampleRange.Text = "Test"
Or look at this site for working with bookmarks:
If you're not talking about inserting text, but retrieving text then:
Set a range from the end of the range of the first bookmark to the start of
the range of the second bookmark using .Start and .End
Then MsgBox MyNewRange.Text