Batch Array Population and Nested Arrays

    @Echo Off & Setlocal EnableDelayedExpansion & Title Batch Nested Array & Goto :Main

:Populate <Element Var Name> <Element Index VarName>

    Set %2=0
    For %%A in (!%1!) Do (
        Set /A "%2+=1"
        Set "%1[!%2!]=%%A"
    )
    Exit /B

:Main

REM Define values of variables within array indices (As Examples)
    For %%A in (one,two,three,four,five) Do (
        Set /A %%A=!random! * 1500 / 32768 + 1
REM Build Array set list for Populate Subroutine. This method of building the set string can be applied to any For Loop.
        If Defined group1 (Set "group1=!group1!,%%A") Else (Set "group1=%%A")
    )

    For %%A in (_One,_Two,_Three,_Four,_Five) Do (
        Set /A %%A=!random! * 1500 / 32768 + 1
        If Defined group2 (Set "group2=!group2!,%%A") Else (Set "group2=%%A")
    )

Call :Populate group1 _A
Call :Populate group2 _B

    For %%A in (group1,group2) Do (If Defined Nest (Set "Nest=!Nest!,%%A") Else (Set "Nest=%%A"))
    Call :Populate Nest _C

Rem Display Array Element Names and Values

    For /L %%A in (1,1,!_A!) Do (For %%B In (!group1[%%A]!) Do (ECHO(group1[%%A] : %%B = !%%B!))
    For /L %%A in (1,1,!_B!) Do (For %%B In (!group2[%%A]!) Do (ECHO(group2[%%A] : %%B = !%%B!))

REM Accessing Variables from the Nested Array (Every Tier):

    FOR /L %%A in (1,1,!_C!) Do (
        For %%B In (!Nest[%%A]!) Do (
            ECHO(Nest[%%A] : !Nest[%%A]! = !%%B!
            Set count=0
            For %%C In (!%%B!) Do (
                Set /A count+=1
                ECHO(Nest[%%A] : %%B[!count!] = %%C = !%%C!)
            )
        )
    )

    Pause
    Exit