Updating an employee cost code in bulk

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Hi,

Is it possible via SQL or REST API to bulk update employee cost code information?

In OTBI, the field is "Department_GL Cost Center Information"."Department_ORG_INFORMATION_EFF_PER_GL_COST_CENTER_INFO__COST_CENTER" from the "Workforce Management - Worker Assignment Real Time" subject area.

We have tried data loading but we would need to reload all of the assignment which is too difficult. 

Thanks