I140 cap exempt, H1B cap exempt - Not used all 6 years

USA H1B Visa
1

I Was on H1 B visa from Feb 2015 to Nov 2017, I have a I140 approved to
Can another employee transfer my H1b on cap exempt?

2

You have two options. One is that you not used up all of your 6 years, so you can use that for cap exempt transfer. Also, second option is based on I-140. If your I-140 was not withdrawn within 6 months, then you can use that for cap exempt as well.