Hello @avdheshkumar ,
I'm not sure why you couldn't add the IE3300-8P2S-E to your BoQ. I just configured a IE3300-8P2S-E in Cisco Commerce Tool (CCW) without any issues. The switch is not announced EOS/EOL which makes it eligible for ordering and selling.
About the IE-3400-8P2S-E suggestion as a replacement for IE-3300-8P2S-E I can't say for sure - maybe because it's 20% more expensive.
The IE-3400-8P2S-E++ is the Cisco manufacturing part number. It's the same product IE-3400-8P2S-E with probably some manufacturing improvements or variations. Not that important in my opinion.
TAA means Trade Agreement Act compliant which basically means the product cannot be sold in certain countries like China, Russia, etc.
Hope this helps.
Regards, LG
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