Sometimes you need to quickly change the Master Page used for multiple pages, for example if you are comparing two potential styles for the publication. Rather than having to go through each page individually changing the Master Page, Opus provides this function to replace all the occurrences of one master page with another.
Select Replace Master Page from the Tools menu. This will bring up the Replace Master Page dialog.
Choose the master page you want to change by selecting it from the first drop-down list box.
Choose the master page you want to replace it with by selecting that from the second drop-down list box.
Note:
To remove all uses of a given Master Page, select <None> in this list.
Click the Replace button.