Ok to have a targeting system you need to understand 2 concepts - VARIABLES and ALIASES.

The first thing you want to do is go into your package editor and create a variable TARGET. There is a menu at the top of the package to create new variables/classes/aliases/triggers etc.

Once you have created the variable you need to create an alias to set your target quickly while your playing. So now create an ALIAS and call it t. Then inside that alias put #VAR TARGET %1 on 1st line then put #ECHO Target is set to @TARGET on 2nd line. What this does if you type "t Bob" it will set your target to bob and echo to screen what your target is. Then just create any alias to use your target with like #ALIAS dt dirt @TARGET this will send dirt Bob when you type dt. Pretty basic setup and ofcourse you can make very complex setups but it wil work.