Need help setting up supplier processing

Colleagues need help setting up a supplier's price list. There is a price list of the supplier in YML and in Excel, but they are promotional, that is, the problem is that in YML there is a description in one language and characteristics, but the vanbox can not delay the availability, but in Excel there is everything but it is more than 9 mb and the vanbox cannot be drawn into itself such a "heavy" file. I need to set up the system so that the price list is automatically loaded and updated with the availability and price, but not for all products, but only for those that I need. Due to the constant lack of light, it is desirable that this be through YML. perhaps someone has a comprehensive solution, the price can be discussed. system of the previous generation MVP on hosting. The transition to the cloud is excluded.