To make changes in your text chunks it is best not to make changes to simply one text chunk. The chances are that if you have a misspelling and you need to update that you should see how many text chunks are affected. So, do a search using the Find, Files Contain process in PersonalBrain. You will be amazed at the number of times you have made an error. The Find window will then give you a list of text chunks to go and revisit and to make those changes.
When you have made any changes you require, then you go to your main MS Word document that has been saved for this new version and Select All text and use the F9 key to update all fields. Your new document will have all changes made.