Range.BoldBi property (Word)
True if the font or range is formatted as bold. Returns True, False, or wdUndefined (for a mixture of bold and non-bold text). Can be set to True, False, or wdToggle. Read/write Long.
expression An expression that returns a Range object.
This example makes the first paragraph in the active right-to-left language document bold.
ActiveDocument.Paragraphs(1).Range.BoldBi = True
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