How to I pull text data from child table and 'combine' into a single text field at the parent level?

Dan, if I had a multiple choice field on the child records called [order] -- (multiple choices 1,2,3,4,5,6,7.8,9,10) --  basically when Concatenate Children records To Parent record -- having the ability to determine what order to concatenate....as well as having a checkbox field -- [Exclude] -- having the ability to exclude child records where Exclude is checked..