Allow several custom fields to save multiple values

Hello

I’m new here in wordpress forum and my english might be a little bad, but I’ll try to explain all my necessity.

I’m developing a new website for my company and I need a new kind of post type. I already did create the custom post type, but I couldn’t add all my needs.

This new post type must be able to create a data table with several values like this PDF.

I thought I could use the custom fields to do it, mas I didn’t find any ways to do these custom fields receive more than one value.

I basicly need a key field named “propertie-something” and more three fields named “method”, “unit” and “value”. These three fields must be connected to the key field “propertie-something”.

I found some solutions for multiple values but none of these solutions works for me.

I’m looking for a solution that doesn’t needs to use a plugin, but if there isn’t any solutions for my problem I will be happy if there is at least a plugin for that.

I hope you understand what I need.