Hi!
When I started to construct the site, for some reason I used the Small Business Flat Demo. However, I now want to change to another demo, Startup Business Demo or Default Demo. However, when I click to import I receive the message that if I proceed my current Theme Option settings will be overwritten. What does that mean? Will I have to redo everything?
All your content will remain, but the settings, layout and look are likely to switch. You can certainly ask the author of that theme before you make the switch. They will be in the best position to let you know what is likely to change.