Once you open up Moomapper you will have a list of ipl files down the right hand side, these tell the game where to place objects in the game world. Objects are split up into different sizes, which means that some large areas are one piece rather than been many. To edit this you will have to use Zmodeller. In other cases you can double click on individual pieces of large areas because they are individual parts of the map.
To rotate objects you double click on the object that you want to rotate either from the map in the middle of the screen or from the list which runs down the left hand side of the screen. Once you have double clicked on the object you wish to rotate you should see a screen similar to this:
On the above screen to the right hand side you can see 3 pieces of text which say ROT X, ROT Y, ROT Z, use the small < > next to that to rotate the objects.
Again on the list to the left hand side of Moomapper simply select the object which you would like to copy by clicking on it once and then simply press the duplicate button above the list on the left hand side of the program you should be able to see it fairly easily.
For more information above using Moomapper look here
and for map file documentation (information) look here