(a) The delegates to a political party's county and senatorial district conventions held under this chapter shall be selected in accordance with party rules at precinct conventions held as provided by this subchapter.
(b) A political party may by rule allow a county to hold precinct conventions before or during the county convention on the same day and at the same place as the county convention. The rule may modify other provisions of this subchapter as necessary for the county to hold precinct conventions as provided by this subsection.