Variables Contain To Cells

I have a doubt, I have two excel's cells that contain numerical values that I assign to variables but it is out of service appear these data at a third cell example cell ( 1.1 ) value 2 var1 and cell (1.2) value 3 var2, the subject is that I want that at a third cell 2-3 appear from the following way But not himself like to do it because if I lay eggs between quotation marks the - you give me error
Example:

Cells ( 1.3 ) .value var1 - var2 ( anything that way not?) And increasing the serious complexity that if the second number is by a digit add it four zeros equal than to the first digit something that way 00002-00002 and if he is over a digit than remove insignificant persons 00010-00012, another example 00002-00132, if they ask me you are for an importable format to a data base and this is a code of identification but the user deposits the data in excel and this column does not deposit porq this conceals this piece of information it is drunk of the first cells with the number.