Looking for a formula to use to establish sizes in stock by just using the
item number. Would need to LOOKUP and CONCENATE to just one cell.

Sample Table Below.

ITEM NAME STOCK Size
1 Jumper In Stock. Small
1 Jumper In Stock. Medium
1 Jumper In Stock. Large
1 Jumper In Stock. X Large
1 Jumper In Stock. XX Large
2 Trousers In Stock. 32 Inch
2 Trousers In Stock. 34 Inch
2 Trousers In Stock. 36 Inch
2 Trousers In Stock. 38 Inch
2 Trousers No Stock. 40 Inch
3 Shirt No Stock. 15 Inch
3 Shirt In Stock. 15 1/2 Inch
3 Shirt In Stock. 16 Inch
3 Shirt In Stock. 16 1/2 Inch
3 Shirt No Stock. 17 Inch
4 Tie In Stock. Small
4 Tie In Stock. Medium
4 Tie In Stock. Large

Result

Item Name Sizes Available
3 Shirt 15 1/2 Inch / 16 Inch / 16 1/2 Inch