Do clerks have to order or is that a manager's job?
i orderz all mah bichez to gimme they money or they kno ima whoop tha ass
Depends on your contract.
Where I am at, it is the department managers job. The department manager can ask the clerks to order but they don't have to if they don't want to.
It is good practice if you want to be promoted or want to be back-up eventually. It is also a nice change of pace from doing the regular tasks.
Here for the fun working environment.