@Dang6
For the app for the Schlage Encode, no I don't think it has the ability to link the locks together. Two locks could be on the same app, say front door and back door, but would need to be programmed separately. It does integrate with Amazon Alexa but I don't know if it could link the locks.
Kwiklock app allows locks to share a folder, however I don't know locks in the same folder can be linked together.
Pretty sure the Remote Lock service by Edgestate would have that function. It allows multiple locks at one address, such as an office building with a front door code, and each code for other doors. However I think they charge per lock.