OMath.Type (Word)
Returns or sets a WdOMathType constant that represents whether an equation is displayed inline with the text around it or displayed on its own line. Possible return values are wdOMathDisplay - Professional format, wdOMathInline - Inline.
Dim objRange As Range
Dim objEq As OMath
Set objRange = Selection.Range
objRange.Text = "Celsius = (5/9)(Fahrenheit - 32)"
Set objRange = Selection.OMaths.Add(objRange)
Set objEq = objRange.OMaths(1)
objEq.Type = wdOMathInline