How to delegate only subdomins to LC i.e. only NS no MX

I have done the following chanes on Public DNS but MX seems to be issue

 

 

ZONE: .wip.domian.com.

 

wip.domain.com. IN NS gtm1.wip.domain.com.

 

wip.domain.com. IN NS gtm2.wip.domain.com.

 

gtm1.wip.domain.com. IN A 200.10.10.53

 

gtm2.wip.domain.com. IN A 150.10.10.54

 

 

ZONE: .domain.com.

 

www.domain.com. IN CNAME www.wip.domain.com