The oblique line of the flight of stairs

[f.annoscia1XRNMD]

How can I extend the oblique line of the flight of stairs ?

Thank you!

[ToanDN]

Are they floors or landings?  Below is @ a landing.

[f.annoscia1XRNMD]

They are floors.

[ToanDN · Accepted solution]

@ Bottom

@ Top: convert the run to sketch and add one more step at top.  Join the floor with the stair.

Or simply add a model in place piece and join with both stair and floor.

[f.annoscia1XRNMD]

Thank you 🙏. I managed to change the stairs, even though the "merge" command is not working!