Inserting a ProjectWise custom property as a text field will insert the current value of the selected property into your document.

If there is no current value — for example, if you insert the Folder_Description property and the document's folder has no description — then the text field will be blank. However because that text field is linked to the property, once a value is defined for that property in ProjectWise, then the field will be updated in the document when an update is performed.