Regarding karnataka vat & cst registration by online

1. VAT/CST registration process can be initiated online but inspection will be carried out by the VAT authorities at your place. Original documents can be submitted at the time of inspection. But I would suggest that it would be better to engage some consultant for this job as it would save a lot of time as well as money.
2. Central excise registration is not necessary at this stage I think.
3. Other registrations necessary would be Shops & Establishment or Factory registration (as applicable), PT, PAN, TAN, PF/ESI (if applicable).

Thank you madam for valuvable suggession. 

Also during filing online application  its asking VAT or COT or Both

NOW I NEED TO REG UNDER VAT.

What is the creteria for COT(Composition scheme under KVAT)

If I Select VAT for Registration in future can i Change to COT or BOTH by written Request letter to RA.

Composition scheme is paying tax at certain percentage if certain conditions are satisfied. Refer Page No.3 of the link: https://www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0CB4QFjAAahUKEwj98dnV6-vHAhWCao4KHX0ZArw&url=http%3A%2F%2Fctax.kar.nic.in%2Fwhat_vat%2FAbout%2520vat%2520nnew.pdf&usg=AFQjCNEI5i_JADncDeUNRfP_AaNJ3gSwvQ&sig2=w9MvYr_BUcNA4kq_GR6cBQ

If you do not want to avail composition scheme then register for VAT only. Probably, it is possible to change later.

How to get Registered Under CST Karnataka, I have already received my VAT Copy a month ago.