Working in mutliple states in same pay period

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Our company is researching issues surrounding time recording for employees who work in different states during the same pay period. Issues surround correct state and local taxation, threshold of work hours being met, and how payroll or HR department is notified that an employee is/has worked in multiple states.

Does anyone have a formal written policy in place that outlines the details around the occasional travel by employees to work in other states. It would state the rules and procedures the employees are to follow whenever going out of state to work, like how, what and to whom they report regarding what state, days there, etc.

If you do, would you be willing to share?