Need help with customsizing

Hey yall, I'm interested in selling with squarespace, I build custom computers and I want to sell individual models and stuff like that, but I want the option to make it really customsizable - where you can pick differetn parts etc, but squarespace doesnt let me to that because it says theres a max of 250 variations?? I used ecwid and it did allow me to add options and variants, or select this or that for X price. But 250 variations means 250 different options. Ecwid has it where you can choose an option, and there will be others avaliable for an extra price but squarespace doesnt seem to have this feature. Am I doing something wrong? If you dont understand the gibberish above, I attached two photos - i want the sqaurespace one to be the same as the ecwid one