How can I replace objects with other objects?

[Mr.S T.FAn102]

If i didin't explain so well im saying, for example: change a deton for a tails doll, change a candy cane into a palmtree.How can i do that? If i have to download those "things" please put the link.

 

[Prime 2.0]

Learn to use SOC. If you just want to replace the graphics though, then just make a wad that has the sprites you want to use, using the same lumpnames as the sprites you want to replace.