Does Turbotax have a way to estimate estimated tax payments based on uneven income? I had to liquidate my company stock whose gain was 3x my income.How to avoid penalty?

I had huge LT CG in May and a severance in June. It's my understanding that I need to pay the tax on the quarter ending in May (paid June 15) for the capital gain and then the next quarter I need to pay taxes on the severance (Sept. 15). I don't expect income the rest of the year except interest. Can I spread it out over 3 payments or do I have to pay most of it at once?