Generating random numbers BATCH

cls & set "range= INPUT RANGE OF NUMBERS WITH VARIABLE?"
for /l %%N in (15 -1 1) do ( set /a "selected=!random! %%%%N*2,next=selected+2"
for %%A in (!selected!) do ( set "Random%%N=!range:~%%A,2!"
for %%B in (!next!) do set "range=!tiles:~0,%%A!!range:~%%B!
)
)

This code generates random numbers.

I am wondering if it is possible to input for example %lines% which is a number into the range area on the first line. Then having it fill in the numbers less than %lines% so it can find a random number that way.