How do I program Bolt module if I connect multiple sensors, say LM35 and LDR?
In such case you can use a dedicated microcontroller like arduino uno. You can connect arduino uno to bolt module and then connect different sensors to the arduino. This setup will work similarly like you have connected the sensor to the bolt module. Then you have to program the arduino uno for this and you have to make a new product with UART mode.
And if you want to connect more than one sensors with the bolt module itself then you can write the code for all the sensors in the same way you write for a single one , and for visulization you can use multiple graph functionality.
You could use Arduino microcontroller motherboard to run a single program at a time again and again or alternatively use Raspberry Pi computer to run multiple programs.