Are you talking about a text box without borders. If so, insert a text box
and manually change the "Shape Outline" to "No Outline". Now, with the text
box selected, click again on the drop down under "Text Box" on the Insert tab
and select "Save selection to text box gallery". In the ensuing dialog box,
give your tet box a name. You can then insert it in the future from the tewxt
box gallery.