2. Determine $$\left.\text{vii}^{\circ}{}^{7}\right.$$ in the key of C minor (C is the root of the $$\left.\text{iv}\right.$$ chord, which is the Roman numeral after the slash): B is the root of $$\left.\text{vii}^{\circ}{}^{7}\right.$$ in C minor because it is a m2 below C.
4. Invert the chord accordingly. $$\left.\text{}^{4}_{2}\right.$$ inversion means the 7th of the chord (A♭) is the bass note.