Calculate the Labour (B) and VAT/BTW (A) amounts given the taxable amount (including labour) and the parts value.

The taxable amount (including labour) is given as R4 701,68. The parts value is R3 451,68.
Labour is the difference between the taxable amount and the parts.

$$B = R4\,701.68 - R3\,451.68$$ $$B = R1\,250.00$$

The VAT rate is 15% of the taxable amount (including labour). The taxable amount is R4 701,68.

$$A = 0.15 \times R4\,701.68$$ $$A = R705.252$$

Rounding to two decimal places:

$$A = R705.25$$

The answers are:
Labour (B): $\boxed{\text{R1 250.00}}$
VAT/BTW (A): $\boxed{\text{R705.25}}$