help in making database structure

I have a simple database with following tables:

MainOrderDetails
Suppliers
Clients

Most of the information stays in MainOrderDetails table.

I wish to create a new table or a field to do following job (we deal in fabrics)

In one field we mention no. of colors. (till now we just used to mention only the no. of colors in the database). But now we wish to mention exact quantity of each color.

So, we need some way to expand the fields according to no. of color entered by user.

2nd case is more complex.

If the order is for printed fabric, user will enter no. of designs. And each designs will have some colors. We wish to store each design each color quanity in separate field.

Could somebody help me how to design this database.

Any help would be highly appreciated.