New ARIN Block Transition and BGP Setup

Hello all,
First post on the forum so I bear with me. I am still young in my carrier and have not worked with BGP on a professional level.
We received a new IP Address block from ARIN and need to transition to it. The boss does not want to do a hard cut over but a phased migration instead. I need to know if this is possible and any configuration guides that might be handy.
Our current IP block is a /26 given to us by our ISP routing protocols are all handed by them we just use gateway of last resort/static routing.
Is it possible to use the same physical link but use sub-interfaces in order to keep our current setup but allow for setup of BGP and the new ARIN block over the same physical interface up to the ISP?
Has anyone transitioned this way before? Or know of any guides that might help me out in the configuration of something like this. We are still in the planing phase and I just need to know if this is a viable solution or do we get another ISP (which is going to happen anyway eventually) and migrate over external services that way.
Thank you,
Jon

Jon
Am I correct in understanding that you have a single router connecting to a single ISP for Internet connectivity? And that the ISP handles routing to you and you have static routes pointing to the ISP? And that you now have been assigned your own block of addresses?
If I have understood correctly then I will suggest to you that you may not need to use BGP as you implement the new address block. I would suggest that you could use this approach:
- configure the new address block inside your network. Ask your ISP to route to these addresses over the existing connection (the ISP should be able to establish a static route for this block in their routing logic).
- your ISP might ask you to advertise the address block to them. In that case you may need to run a dynamic routing protocol between your router and the ISP. Ask the ISP what routing protocol they support. BGP is probably one alternative but the ISP may have other routing protocols that they support for customer connections.
HTH
Rick

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