SBI - How can you buy less than the required chunk of shares?

[kansaifolk]

Hi, I think I remember someone mentioning that you can buy less of the set amount of shares of a stock on our SBI account by clicking a certain button. But I can't find that post. Does anyone know how to do this? I would like to buy some Softbank while it is down but I don't want to purchase the full 100 shares. Thank you.

[RetireJapan]

https://www.retirejapan.com/blog/buying ... -equities/