In your document template, create a building block entry of the Primary Page Header content (minus the final paragraph mark). Name it "HPP"
Create a building block entry of the Even Page Header content (minus the final paragraph mark). Name it "HEP"
Run this macro:
Code:
Sub ScratchMacro()
'A basic Word Macro coded by Gregory K. Maxey
Dim oHF As HeaderFooter
Dim oRng As Range
For Each oHF In ActiveDocument.Sections(1).Headers
Set oRng = oHF.Range
Select Case oHF.Index
Case wdHeaderFooterPrimary
oRng.Text = vbNullString
oRng.Collapse wdCollapseStart
ActiveDocument.AttachedTemplate.BuildingBlockEntries("HPP").Insert oRng
Case wdHeaderFooterEvenPages
oRng.Text = vbNullString
oRng.Collapse wdCollapseStart
ActiveDocument.AttachedTemplate.BuildingBlockEntries("HEP").Insert oRng
End Select
Next
lbl_Exit:
Exit Sub
End Sub