Integrating External Laboratory in OpenEMR 5.0.1

Hi all,
I am new to OpenEMR and basically learning about the system.
Currently, i want to learn that how to integrate an external laboratory and what laboratories will be the best for understanding and learning purpose.
I tried to refer the following document but it didn’t help… https://www.open-emr.org/wiki/images/9/92/LEN_User_Documentation_v1.0.pdf