Inflating each menu and calling to super works great!
Here is an example:
@Override
public boolean onCreateOptionsMenu(Menu menu)
{
super.onCreateOptionsMenu(menu);
getMenuInflater().inflate(R.menu.main, menu);
getMenuInflater().inflate(R.menu.other, menu);
return true;
}
You can control the order if super also adds more items by calling it before/after other inflates, or not call at all it to ignore those items.