How to mass change the interfaces in/out bandwidth speed?

Is there a way to bulk change the bandwidth speed for multiple interfaces?

How to do a Bandwidth Override for interfaces in bulk?

The bandwidth override can be set using two methods:

1. Manually on the device: Device Administration

2. Via API: Bandwidth Override API

The API is the option for bulk changes. 

The API request must be a JSON-formatted request, and it can be set in the following format:

{
    "password": "D**********************",
    "pin": "1*****",
    "groupFilterBy": "device",
    "groupFilterValue": "A*********",
    "operation": "add",
    "expression": "Fast************",
    "bandwidthOverride": {
        "inbound": {
            "speed" : "100", 
            "unit" : "G"
            }, 
        "outbound": {
            "speed" : "100", 
            "unit" : "G"
            }
    }
}

A snippet from a third-party tool API call is provided for reference:

For scenarios where a bandwidth override has already been applied to an interface, the operation field in the payload must be set to 'replace' instead of 'add'.

Once the bandwidth override has been added or replaced, a device rediscovery is required to sync the values with the performance metrics. A global rediscovery can be done from the Administration menu (Administration >> Change Devices >> Rediscover devices). The related document can be found here: Discovery Poll.