I feel sorry for all GATech students. This is one of the antiquated non-intuitive interfaces I have seen in decades. This is my notes on course selection.
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Login to OSCAR
Click "Secure Access Login"
Click "Student Services & Financial Aid"
Click "Registration"
Click "Lookup Classes"
Select Term - Spring 2021 & Submit
Select "Advanced Search"
Select the following Subjects:(use Ctrl Click to select multiple)
CSE Computational Science & Engr
CS Computer Sc
ISE Industrial & Systems Engr
MGT Management
Select Online Campus
Click "Section Search"
Scroll down the page.
Search for Course No (eg: 6501)
The filter shows both On campus and Online (even though you have campus filter in prev.page).
Select one with OAN for Online in Cmp column.
Select the first col checkbox and hit Submit at the end of the page.
Columns:
CRN - Course Registration Number
Subj - Subject
Crse - Course #
Sec - Section (If you see A and A01, select)
Cmp - Campus
Bas - Base - grade type (P audited,
Cred - Credit
Cap - Capacity
Act - Actual - how many singed
Rem - Remaining seats
Also see this video
https://registrar.gatech.edu/registration/registration-assistance