Monster Import: Simple Or Complex?

[DumbLuck]

I want to import sprites in to The Ultimate Doom, add them to the already existing lineup. Is this possible using only Slade 3, or do I have to learn how to edit maps? I do not understand enough about this stuff to be able to articulate what I mean to say. Can I just import monsters and have them spawn as though they are the default sprites, or do I need to go through every map and place them in it, using Ultimate Doom Builder?

[m8f]

If you are making a monster replacer/randomizer, please take a look at RandomSpawner. You define your new monsters, then you place them on the map with RandomSpawner. No need to edit the maps, and it will be compatible with custom maps too. Slade 3 is sufficient for this. You can even get away with any text editor and zip archiver, if are so inclined.