Create a spreadsheet including the sequential numbers for your Record Number field say 1 to 1000. One way is to use Words built-in numbering in this manner. Adjust the header margin and font values as necessary.
10 steps to creating inline numbering in a Word document 1.
Click the Insert tab. In the first label space type the recurring prefix. Key in seq followed. When I save and close the form I want the number to remain the same and and generate a new number.