various business against one gst registration of a company

yes, why not..? This can be happened

make it clear plz

lets take an example, A company is engaged in trading of goods and their installation. like A.C. dealers. Rates of GST are different for both if them. So, company will charge GST on both kinds of transaction accordingly.. As per my view, it is better to make separate invoice for both of them.

Simultaneously, the company is also engaged in the business of security appliances. It can also be covered under the same.

The only thing you need to take care that all goods and services should be categorically classified in the registration.

there will be when GST registration for each state so any company dealing in any type of goods within that state can do business for all the goods with one GST registration. however if the same company is dealing in another state then it has to take another GST registration so the GST registration is not dependent on the type of goods dealt but there is one registration for each state however there is a concept of business verticals and so any company can take different GST registration for each business vertical