Short answer

Where do I find my district's rules for moving across the salary schedule?

In three district documents: the certificated salary schedule, which names the columns; the bargaining agreement or board policy, which says which units count and when they must be earned; and the HR form for salary reclassification, which sets the approval step and filing deadline. Each guide below links all three where the district publishes them.

Districts appear here only when their own documents could be read and dated; districts that do not publish their rules online are left out rather than guessed at. Your state guide covers license renewal, and how a salary lane change works explains the general process.