Azure Management Groups

you can select the resources and then hit the option move it will do the pre-checks and move the resources . it is always a good idea to check the checklist outlined below and the move support resouces .
https://learn.microsoft.com/en-us/azure/azure-resource-manager/management/move-support-resources
Keep in mind the user access permission as an example if B is the owner of the subscriopn x , and A is the owner of the subscription Y then when you are moving resouces from Subscription X-Y check for right permission to avoide inheritance also check the vnet peering and firewall rules if you have to change . Since the VNET IP range is per environment I guess you will not have any issues but there might be change in resouces ID
look at the checklist outlined below https://learn.microsoft.com/en-us/azure/azure-resource-manager/management/move-resource-group-and-subscription

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