Editing Texas Constitution talk:Article XVI, Section 69 (section)

== add ? ==

Article XVI, section 69 of the Texas Constitution provides that “[tlhe legislature
may require, by rider in the General Appropriations Act or by separate statute, the prior approval of
the expenditure or the emergency transfer of any funds appropriated to the agencies of state
government.” Tex. Const. art. XVI, 5 69. The legislature has delegated to the governor and the
legislative budget board the authority to redirect legislative appropriations in case of an emergency,
when the legislature is not in session. 

https://www2.texasattorneygeneral.gov/opinions/opinions/49cornyn/op/2002/pdf/jc0501.pdf

The governor is not authorized to increase or appropriate state
motor vehicle registration fees. However, chapter 3 17 of the
Government Code authorizes the governor and the legislative budget
board in the event of an emergency to act to redirect state motor
vehicle registration fees already appropriated by the legislature for
particular purposes to other uses permitted by article VIII, section 7-a
of the Texas Constitution.