Sucre is a city in Bolivia.
South towards Potosí
Take micro n°100 or 101 until Yotala (Bs.3), where you'll find a tranca (toll gate). From there it's pretty easy to get a ride, since cars have to slow down you can also talk to drivers. Alternatively, you can take bus n°4 (Bs. 1,50) and get off about 1-2 km after the tejar, which is a petrol station. From there you have to walk few minutes to get further out of the city, but then you can get a ride to Yotala and the tranca.