New to macro building so trying to start small while I get my head around it all!

I would like to create an offset line within a sketch from a selected face and link the dimension to a variable.

setup:

Open all new parts using a standard part and assembly template to set up the common global variables I want to use
Global variables created by template - "rebate"
Sketch on the target surface open with one face selected

Run macro:

Macro uses the edges of the pre-selected face to act as the input edges for an inward offset
The offset is applied and then dimension changed to the global variables "rebate"
The selected face and edges are deselected
End

I have had a bit of a play around with codes I have found but can't work out how to link the created offset dimension to a global variables. Any one help me understand how to select the created dimension offset command and linking my variable.

Thanks
Krishna

Dim swApp As Object
Dim Part As Object
Dim ModDoc As ModelDoc2
Dim boolstatus As Boolean
Dim longstatus As Long, longwarnings As Long
Sub main()
Set swApp = Application.SldWorks
Set ModDoc = swApp.ActiveDoc
Dim SelMgr As SelectionMgr
Dim EdgeCount As Integer
Dim Edges() As Edge
Dim SelFace  As Face2
Dim SelData As SelectData
Dim SelectedCount As Integer
If ModDoc Is Nothing Then
Else
     Set SelMgr = ModDoc.SelectionManager
     If SelMgr.GetSelectedObjectCount2(-1) = 1 Then
          Select Case SelMgr.GetSelectedObjectType3(1, -1)
                    Case swSelectType_e.swSelFACES
                         Set SelFace = SelMgr.GetSelectedObject6(1, -1)
                         If SelFace Is Nothing Then
                         Else
                              EdgeCount = SelFace.GetEdgeCount
                              Edges = SelFace.GetEdges
                              Set SelData = SelMgr.CreateSelectData
                              ModDoc.ClearSelection2 (True) ' This Clears the selected Face
                              SelectedCount = SelMgr.AddSelectionListObjects(Edges, SelData)
                              swApp.SendMsgToUser2 "There Were " & SelectedCount & " Edges Selected", _
                          swMessageBoxIcon_e.swMbInformation, swMessageBoxBtn_e.swMbOk
                          Set Part = swApp.ActiveDoc
                          boolstatus = Part.SketchOffsetEntities2(-0.00001, False, False)
                          '' connect "rebate" to the offset above
                        Part.ClearSelection2 True
             
                         End If
          End Select
End If
End If
End Sub