gawk

@echo off
for /f %%i in ('sed -r "/产品名称b|产品b/!d; s/.*数量为?([0-9]+)；?$/\1/" 1.txt') do (
    set /a numB+=%%i
)
echo 产品b一共: %numB%
for /f %%i in ('sed -r "/产品名称c|产品c/!d; s/.*数量为?([0-9]+)；?$/\1/" 1.txt') do (
    set /a numC+=%%i
)
echo 产品c一共: %numC%
pause
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