In GUI...
1. Go to FILE >> PREFERENCES >> GENERAL TAB, then check the "Automatically create unknown variables...."
2. Copy ALL the objects like units/abilities/buffs etc...AND the triggers to your new map...
3. If it doesnt work, then you did it wrong...
4. If you have 2 computers you can easily mirror the correct one...
In JASS/vJASS...
1. Download JassNewGenPack if the system is written in vJASS...
2. Do as the #2 in GUI method...
3. Well, most or 100% of JASS/vJASS systems/spells have very easy instructions, so read them...
4. If its not working, then you have done something wrong again...
If still you dont understand, then I suggest you to PM someone to help you...