I have never used merge fields, but I will use VBA to manipulate text boxes. The name and content of VBA call text box are as follows:

Call the name code of the text box

Sub？ getTextboxName()

For what? Me? =? 1? Where to? This document. Shape, count

What if? This document. Shape (1). Type? =? msoTextBox？ then what MsgBox？ This document. Shape (1). name

then

End? submarine

The following calls the text box content code.

Sub？ getTextboxContent()

For what? Me? =? 1? Where to? This document. Shape, count

What if? This document. Shape (1). Type? =? msoTextBox？ then what MsgBox？ This document. shapes(I). text frame . text range . text

then

End? If there is a call to the contents of a text box containing subfields, you can use val (thisdocument. Shape (1). Text frame. Textrange.text) function converts numerical judgment into single precision and double precision.