It is just a matter of swapping the documents and their ranges around so that you copy one range to the other e.g.
Code:
Dim oDoc As Document
Dim oTarget As Document
Dim oBM As Range
Dim oRng As Range
Set oTarget = ThisDocument
Set oBM = oTarget.Bookmarks("bookmark").Range
Set oDoc = Documents.Open("C:\Users\jovany\Desktop\NEW WOSPC 9.2.1_RMIR - Rollout.doc")
Set oRng = oDoc.Range
oBM.FormattedText = oRng.FormattedText
oBM.Bookmarks.Add "bookmark"
oTarget.Activate
oDoc.Close 0
Set oDoc = Nothing
Set oTarget = Nothing
Set oRng = Nothing
Set oBM = Nothing