@echo off
setlocal enabledelayedexpansion
set "SrcFolder=D:\Test\A"
set "DstFolder=D:\Test\B"
set "MoveTotal=80"
set "MoveCount=0"
set "FileCount=0"
for /f "delims=" %%i in ('dir /b /a-d "%SrcFolder%"') do (
    set /a FileCount+=1
    if !MoveCount! lss %MoveTotal% (
        set /a m=!FileCount!%%5
        if !m! equ 0 (
            set /a MoveCount+=1
            move /y "%SrcFolder%\%%i" "%DstFolder%\"
        )
    )
)
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