Backup management: how to update a Time Machine backup on a different Mac?

Hello everyone,
I need some advice. I have a question, which I think is simple, but my situation is a bit complicated, so I am not sure about what to do.
I will try to describe it as simply as possible.
There are 3 macs:
A: an old macbook (the white one)
B: a modern macbook pro (retina)
C: another modern macbook pro (TBD)
I am giving away B now; I expect to get C in 2 months time; I keep A with me all the time.
The goal is to migrate all of the data from B to C.
I have Time Machine backups of B.
Since the transition is a long time (2 months), I need to keep working on my data during this period. For this I will use A. This will generate new files, modify old ones, ...
Since A's HDD is much smaller than B's backup, I can move only part of them.
By the way, I have totally erased A and used migration assistant to restore part of my old data from B. So, when I use A now, I do it with my same account as in B (and the same I will use in C).
How do I manage my backups in such a way that, when I will get C, I can safely move all of the data I had in B plus all of the changes and modifications that I have done during the 2 month transition?
Can I just continue to use Time Machine (on A) to update the old backups? I am afraid that some mess could be created because the computers are different (before the backups were taken on B, while now on A), even the present data are different (because now A only contains a subset of the original B data, which I do NOT want to lose), the good point is that the user is the same.
Thanks for the patience to read through. If something is not clear I will be happy to explain better.

When you get MBP C and start it up for the first time you will be given the option to transfer data or not. You can transfer data from another Mac or from a backup such as Time Machine. The former requires that you be able to connect the two computers directly together either by Ethernet cable or by having both connected to a local Ethernet network. You can use wireless, but it's very slow compared to Ethernet, so I don't recommend wireless.
If you expect to perform the transfer from a Time Machine backup, then be sure to perform a backup of MBP B just before using it to transfer data to the new MBP C.
This same process can be used from MB A provided it is running Snow Leopard or later.
Also, see Pondini's Time Machine FAQ for help with all things Time Machine.

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