How to sort the types of materials from one column

I have in Sheet1, column B, 5 types of materials. In column L, I have numbered the position of each one.So, Position 1 to 6, is 'Plastic tube'

I need a formula, in Sheet2, that can calculate this automatically, so for each type of material to show in what position can be found.

Like this:

or

It would be better if can be search by position, because the types of material can be one, 2, or more

Link: https://docs.google.com/spreadsheets/d/1CDdvFChCx2_1bZ3rY2ZApQOjOM22rTcLx4mUllNqYqw/edit?usp=sharing