[AVAILABLE] message window

hi  im new to rgss and was wondering if it was possiby to make a script to make a more than 3 line message box but still keep the \ functions i havent found any and would realy like one
or have variables shown avialble in a cms would help thanx
for example i wanted to make variable 1 be a rescourse for construction and variable 2 a different rescourse would it be possible to have a list like widow in the menu to show all the variables or in a message box