hi, can someone explain to me how to use ignore csv's please

Go to zone_source/english/assetlist. Look through the following .csv's

mod.csv
code_post_gfx.csv
common.csv
patch.csv
nazi_zombie_mapname.csv
nazi_zombie_mapname_load.csv
nazi_zombie_mapname_patch.csv

Copy and paste a .csv file and delete everything inside it. Rename it to whatever you like (my_ignore.csv for example). Inside add all the lines for all the things you don't want loaded in your map from the .csv list above.
Add this line to your mod.csv in your mod folder

ignore,name_of_ignore_file,,