You can take registers in Manage Register by Dynamic Groups, and attendance codes are attached to the student rather than the form.
Set up a Static Group in Data Digger, which gets converted to a Dynamic Group. You can set up a Static Group for these students in Reporting > Data Digger. At the base of the page click on Manage Static Groups.
Enter a Group Name, then add students by clicking on the Add button.
Once you have added all the students, go back to the main page in Data Digger. On the right side there will be a number 1, and at this dropdown select Static Group, then the name of the Group.
Click on the number in the centre of the circle (this is the total membership of your static group), where you can enter a name for this group and convert it to a Dynamic Group.
Now go to Register > Manage Register. Select the particular Dynamic Group from the dropdown at the top right of the screen, then View Register.
The students in this group will then be together for the register to be taken by an admin staff member (or someone with Admin or Junior Admin user role on ScholarPack).