Reordering Credits and Blocks
The Credits Gdoc can be edited like a regular spreadsheet.
To re-order credits, select a row in the Credits Gdoc, grab it by the row number, and drag and drop it to the new position.
To move a whole block, select a group of rows. Select the first row, hold the shift key, and select the last row. Then drag and drop that selected group to a new spot.
After editing the Credits Gdoc, click "Reload Credits" in Layout to sync the changes.