Each circumstance is different, but job restructuring can be one type of reasonable accommodation. California's disability regulations recognize that one type of accommodation can include reallocation or redistribution of non-essential job functions in a job with multiple responsibilities.
Employers are required to engage in a good faith interactive process with the employee with a disability to find reasonable accommodations that are effective in enabling the employee to perform the essential functions of their job. Employees that request reasonable accommodation of a disability are protected from retaliation regardless of whether their request is granted.
You can find more information in the Reasonable Accommodation section of the HR Library.