There seem to be two parallel tracks running here. Let's segregate and look at the fundamentals:
What is CTC?
The name itself signifies what it means: Cost to the Company. Here is a simple example to explain CTC more simply.
The CTC of a person is, say, 12 L per annum. This means 12 L will include his monthly, annual, and all his bonuses/incentives.
Now, as a company, I can give him:
1. 50 K per month and 6 L at the end of the year.
2. 20 K for the first 3 months, 40 K for the next 6 months, 60 K for the following 3 months, and 7.2 L at the end of the year.
3. ...and so on.
The point is, there are no set rules that say you cannot increase a salary every month/quarter/period. So, you can have different salary packages within a single financial year.
One industry that does this is the IT industry, where performance appraisals are done every 6 months in some companies, and increments are given.
An increase in salary upon confirmation is quite a normal trend in a lot of smaller companies.
How/What Should You Increase in the Salary Structure
Typically, the basic and all components connected to the basic (like the HRA) are not tampered with unless there is a grade change, which could be annually or more than that. What is played around with are allowances (and you can give it any name that you want).
Cheers!!!
Regards,
Navneet