Copy, Insert Row Below And Merge Content Of Two Cels

I have a list of 12.000 pictures which have to be "connected" with the article number (1000) & color (21). Here starts the problem... Each article usually has more than 2 colors, but is listed only once per row and the colors are stated in columns.

What I would need is a macro or function that would do from such structure:

art description color1 color2 color 3

1000 product A 21 22 23
1001 product B 19 23

this:

art. description picture

1000-21 product A, color 21 1000-21.jpg
1000-22 product A, color 21 1000-21.jpg
1000-23 product A, color 21 1000-21.jpg
1001-19 product B, color 21 1001-19.jpg
1001-23 product B, color 21 1001-19.jpg


1. check if the row in color columns is not null
2. if this is true, then I would like to copy the entire row & paste it below existing
3. then the "art." column would be changed (=A2&"-"&C2), so the article woul get suffix of the color (and column "picture" would be created, maybe something like =A2&".jpg")
4. if any other color column in the same row is greater than null, then proceed to next color & repeat steps 2. & 3., else go to next row
5. until all 5000 rows are converted in about 12.000 rows.