If you are refering about how to change the sky (called skybox) in each level, that's something you set in
MAPINFO (if you don't have said file in your wad, create it via Slade).
This is an example taken from the wiki. First you import into your wad the picture you intend to use as replacement for the sky and then write the exact filename in the line that starts with
sky1 and then repeat the process for each map specifying that same line with the name of each different picture you prepare:
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map E1M1 lookup "HUSTR_E1M1"
{
levelnum = 1
titlepatch = "WILV00"
next = "E1M2"
secretnext = "E1M9"
sky1 = "SKY1", 0 // Here is where you set the filename of the sky pic you want to use. It goes between " ".
cluster = 1
par = 30
sucktime = 1
music = "$MUSIC_E1M1"
}
It may seem difficult to understand at first (
here is a description of what does each line means) but you don't need to specify each and every one of the properties of the map like in the example, only the ones you need. You can always open maps from other people and see what they did to use as reference.
On the other hand, if you meant something like having an image appearing before/after each level, then you are looking for "
cluster" instead of "map". Both are set in MAPINFO, anyways:
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cluster 1
{
PIC = "YOURPIC1" // Here you specify the filename of your image.
music = "$MUSIC_VICTOR"
exittext = lookup, "E1TEXT"
}