Você pode criar uma propriedade de documento personalizada ( Exibir ou alterar as propriedades de um documento do Office ):
Click the Microsoft Office Button Button image, point to Prepare, and then click Properties.
In the Document Information Panel, click the arrow next to Document Properties, and then click Advanced Properties.
In the Document Properties dialog box, click the Custom tab.
In the Name box, type a name for the custom property, or select a name from the list.
In the Type list, select the data type for the property that you want to add.
In the Value box, type a value for the property. The value that you type must match the selection in the Type list. For example, if you select Number in the Type list, you must type a number in the Value box. Values that don't match the property type are stored as text.
Click Add.
Em seguida, insira a propriedade personalizada do documento em seu documento ( Adicione informações sobre propriedade a um documento ):
Click where you want to add a property control in your document.
On the Insert tab, in the Text group, click Quick Parts.
Click Document Property, and click the control that you want.