Change Region Button

I have an existing website with a search form that has the following structure: Choose Country > Choose Region > Display Property. The form is functional and works. The elements in second dropdown for "Choose Region" depend on the selection of the first choice, "Choose Country". The dynamic dropdown works and the results page is built and function. The details page for "Display Property" needs to have a button on it that allows the user to change region, without going back to the front page. So, if a user selects Italy > Rome, they see properties in Rome. If they are viewing 1 property in Rome, I would like to have a button that allows them to change region. The dropdown, will display the other regions in Italy for which there are properties. The website does not have more than 10 regions in one country and only contains about 200 properties, so this ia not a huge site. The code is already written and working on the front page. I have already built the UI and need it connected so that it displays the dynamic dropdown already implemented on the front page. This should not be difficult for those familiar with search.