Well.. one way would be to call GetItem(index) and check if it is the bookmark that you want to edit. The bookmarks object is an array of bookmarks in the word document... so just find the one you need and then use that index and edit it with the value that you want. The value is just a string. Create your string based on whatever requirement you have such as the value of a cell in Excel.
My requirement is to set the complete row values into word bookmarks once I click on a button. I am getting the values into message dialog box but How can I set each and every cell value to the respective bookmark. Please help me with the logic?