with this prestashop addon you can define what will be the maximum value of products from selected categories that customer can put into cart and order. Module has feature to define conditions for customer groups. This means that for example simple customer will have possibility to order products worth max €100 from category T-SHIRTS while wholesaler customer will have possibility to order products for €1000 etc.
You can define as much conditions related to maximum purchase as you want.
Customer will have possibility to place an order in the shop only if their cart will meet defined requirements.
details about the module you can find here:
Module to define max order value from category