TJA1145T_FD Transceiver.pdfAttached is CAN Transceiver Datasheet. This IC is wired in our Microcontroller based Electronic Control Unit.

CAN_A_H1 and CAN_A_L1 are connected to CANH and CANL of Transceiver.  Also, CAN_A_H2 and CAN_B_H2 are connected to same CANH and CANL ?

can bus is a multi drop connection. the tranceivers' outputs  are wired in parallel, so in this cse there are two other can bus devices connected to the can bus device in question.

CAN bus is a bus just as the name implies, transceiver CANH and CANL pins are all directly connected in parallel with a termination at each end of the bus. The two external connections are probably used for point-to-point attachment to adjacent control units or to a 120 ohm termination at each end:

    T--CU----CU-- ... --CU--T

On the CAN bus Wikipedia page there is a nice picture of how CAN bus transceivers and terminators are connected.