@echo off
echo KEEP THIS OUTPUT
CALL :timer 10
ref Do more things...
EXIT

:Timer
set time=%~1

:loop
cls

echo Countdown - [%time%]

set /a time=%time%-1
if %time%==0 goto timesup

ping localhost -n 2 > nul
goto loop

:timesup
echo Timer completed!!
EXIT /B 0

KEEP THIS OUTPUT
Countdown - [10]

KEEP THIS OUTPUT
Countdown - [9]

KEEP THIS OUTPUT
Countdown - [10]
Countdown - [9]

Countdown - [9]