Hello deepakrajanna
You can setup as many grading scales as you need from the Grades > Grading Scales program.
Click on the "+" tab to add a scale.
You might benefit taking the Quick Setup Guide which has a dedicated section for this:
https://www.rosariosis.org/quick-setup-guide/
You will find more details about each column and option in the inline help / handbook.
Then, about terms:
In RosarioSIS, a grading scale is associated to a course period, not a marking period.
One solution, if your courses run all year:
When a new term begins, simply switch the grading scale from the Scheduling > Courses program.
This will not affect existing students' final grades for past terms.