Tabular Model Lookup Function

Hi,

I have a query regarding the lookup function in a tabular model. I have a fact table as follows :

Farmer Code                      Milk Quantity             Fat%

f1                                       100                            3.8

f2                                        200                           5.3

There is a dimension table storing buckets of fat % as follows

id          from%      to%     Bucket Name

1           2.5           4.0       Low fat

2           4.1           6.0       Medium Fat

i want to create a column in the tabular model to store the id of the bucket table matching the fat percentage of the fact table. the final result should be as shown :

Farmer Code                      Milk Quantity             Fat%          bucket_table_id

f1                                       100                            3.8             1

f2                                        200                           5.3              2

What function of DAX can achieve this ?

Secondly once i create such a column, will i be able to use this to link back to the bucket table ?

A quick answer would be highly appreciated.

Kind REgards

Sanjay Shah, Prosys, pune