Not sure I understand.
I think you have a relationship or a post object field that is on the home page. On the home page you get the relationship or post object field and then show a custom field that is on the post indicated in the relationship or post object field?
Do I have that right?
If not, please explain in more detail.
An options page would be a good way to do this if you want to show the same thing in multiple pages, but if I understand what you want to do (see above) it can be done without using an options page.
