need help with CHDs

Ok going to sound like a complete noob here . I have downloaded all the parts of the chd for a game. Now how do i stitch them back together or what do i have to do with the files besides make their own folder. I have been out of doing this for so long but in retirement I want to share the fun of arcades games with my little one.

You need to use WinRar or 7zip to uncompress the files and obtain the CHD file.

Yeah i finally figured it out. Been away from this stuff too long. Just forgot how to put the file back together. but thank you very much for your help.