If you mean changing from one Sort to another
within your building, this National Master language applies:
Article 22 --- Part-Time Employees
Section 4
. . .
The following will be incorporated into the job selection procedures in the applicable Supplement, Rider or Addendum:
The Employer will fill all vacancies and permanent new jobs for part-time employees from the part-time selection list in all months except November and December.
Part-time employees with six (6) months or more seniority shall have the right to place their name on the list of employees waiting to be moved to a preferred job within their building. Such preferred jobs shall include, but not be limited to: Preload, Sorter, Clerical, Irregular Train, Designated Responder, Carwasher, Loader and Unloader. Employees do not have the right to select any specific unit, load or workstation unless a prior past practice has been established.
Part-time employees with less than six (6) months seniority shall have the right to bid a preferred job prior to the Employer hiring from off-the-street.
A maximum of twenty-five percent (25%) of the employees on a shift shall be allowed to change shifts in any one (1) calendar year. The employee obtaining the new position shall remain on that shift for at least six (6) months.
http://www.teamster.org/sites/teams...06 09 Final UPS Master Agreemnt 2008-2013.pdf
Check your Supplement for possible language as well.
http://tdu.org/node/1617