If there are many stores connected each other via network and each of one must have a picture of the availability of all, then we need to send the availability to custom fields via sync.
In sync, we create 3 companies and link their databases. We must always have 1 server to share the data, in this example the database “KETS”. We connect the other stores with the main database:
The 1st store has a custom field with the number 1 (so 1c), the store 3 is the server, the number 3 (so 3s) and all the stores the number 4 (so 4t):
After the end of the synchronization, the 4 custom fields must be the same between the stores and their availability: