Adjusting inbound rules on 3CX is something that can be completed through the management console. If you do require access to this, please reach out to our support team and we can organise access for you.
Once you have logged into the management console, select "inbound route" and then select the inbound number you would like to edit which will open a menu shown below
What we are looking to update is the Destination for calls during office hours by changing this we are able to redirect where calls are going, in this example, I will show you how to forward it to an outside number.
From here, the below field will allow you to enter an external number as shown below.
Once you have entered the number you wish to divert them to, click on Ok up the save your changes. From here all inbound calls during office hours will go to the designated number you have entered.
If the above steps did not resolve your issue, you can raise a case with our team by clicking here. We may verify that you have completed the above steps, so don't forget to try!