Hello, I would like to understand typically the percentage of engineering cost and percentage of training costs of entire SCADA automation plant in general. I would appreciate if someone shares some inputs

It may be in millions depends on no. of tags u want in SCADA & time consumed in developing that. Training is cheap.

Vipin sir is right, training cost is low

For less cost training or project engineering,
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Could you specify your question?
Training cost of training engineers to build you a system based on a specific SCADA vendor?
Training cost for operators and maintenance staff?
For engineering, there are so many variables based on experience with a platform, size of the plant, choice of vendor, choice of system design, redundancy, virtualization, archiving, OEE etc. etc.
In general the biggest costs will be in engineering. In most cases it will bring you more benefit to choose a platform that will cost more on hardware & licenses but is user friendly then to go for lowest purchase price and though engineering.

Training cost for operators and maintenance staff?
where we can get this course and the total amount?

Often forgotten, it is great that you have a new system build for you, but you have operators who need to work with it every day. Most likely you will have your own maintenance staff who will need to be at least 1st line support. Time needed depends on the size and complexity of the plant.
There are two ways to go, you might want to combine them:
- Have the system integrator who builds the system provide a hands on training to the operators. Show them basic features (start, stop, setpoint, etc..), Error handling (warnings, alarms, etc.), System navigation.
This way the operators gain confidence with the new system, the engineer can show them around and answer the questions they might have.
- Have the system integrator provide hands on training to your maintenance staff. Show them the system, possible errors and warnings, likely causes for errors, checklists to solve routine issues, how to replace parts that are subject to wear etc.

- You could go for a more general approach by sending your staff to vendor workshops and training. Most mayor vendors offer workshops that take half a day or a day, where you can get a basic feel for the platform. They also offer maintenance specific training of several days up to a week, here your maintenance staff learns how to locate and solve issues with the platform, common issues and how to avoid and solve these etc.

I think this is really a good investment, especially when you build a new plant or switch vendors. It is a safe way to get to know the system, if you need to find your way in a running plant the risk of damage is high as well as the pressure and stress on your staff.