What version of Sublime Text are you using, and what OS?
Mine is beta build 3059 on Win7 x64 and this is how i do it to replace something:
- Press Ctrl+H to open window for replacement.
- Enter search term.
- Enter term to replace.
- Press Ctrl+Alt+Enter to replace all occurrences of that term.
If this is what you've meant than that is how you can do it.