Merging Rows And Keeping Unique Values

I have this query and it works except for I am getting duplicate primary keys with unique column value. I want to combine them so that I have one primary key, but keep all the columns. Example:

Key column 1 column 2 column 3 column 4
A 1 1
A 2 2
B 2 3
B 5 5

it should look like:

A 1 1 2 2
B 2 3 5 5

Here is my query:

SELECT *
FROM [TLC Inventory].dbo.['2014 new$']
WHERE [TLC Inventory].dbo.['2014 new$'].mis_key LIKE '2%'
AND dbo_Product_Info#description NOT LIKE 'NR%'
AND dbo_Line_Info#description NOT LIKE 'OBSOLETE%'

Do I use a sum function?