wrote:

I want to remove 6' of a 10' internal breeze-block wall. The wall
supports the ends of 4' floor joists, the other ends of which are
supported by the external wall.

These floor joists are also nailed into a perpendicular joist that runs
the entire front-back width of the house, offset an inch from the top
of the internal wall.

If you want some sort of useful answer then you will need to tell us:

Dimensions of all timbers, span of the floor joists and the
perpendicular joist, and details of all loads carried by each of the
joists.


--
Cheers,

John.

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