copying students and grades to other classes

i would like to copy students along with al of the other columns and grades to other classes but it seems you can only copy the student to another class and not all the other attached information in other columns.

Is there a way of copying all the rows of grades next to the student name to another class?

You can copy both, students and grades.
For the columns to transfer with its grades, the students must exist in the target class already.

In order to copy students to another class: Tap on Tools (top bar) > Students > All > Copy
In order to copy columns to another class: Tap on Tools (top bar) > Columns > All > Copy
In order to copy a full tab to another class: Tap on Tools (top bar) > Tabs > Select> Copy

You can also copy a single column or tab with a tap&hold > copy on that particular item

If you'd like to replicate a complete class, from the main screen with the list, tap and hold on a class and Copy

Here is the article that explains it in detail