How to create assignment in Grade book for the whole school year

When creating an assignment in Grade book, click "Show advanced settings":

Select "whole year" in the "Term" column if the assignment is valid for the whole school year.

Change the settings of your present assignments in "Settings" via the 'Manage assignments" button.

It is possible to change the validity of an assignment from "1st half year" to "whole year" in the "Term" column. The assignment will be displayed in second half year too.