first sheet data need to update from second sheet

dear friends.here i have attached my document.i want to update first sheet according to second sheet data.my requirement is ,,,
01.need to check second sheet column "G" empty or not.
02.if column "G" is not empty then same row column "B" value need to match with first sheet column "K"
03.if anything matched & first sheet same row column "L" value is " NOT DYED " then that cell need to clear.
some time second sheet column "B" value is " 130216A " & first sheet sheet column "K" value "130216A-B".
in this case we have to match only first 6 characters.if whole cell is not match & first 6 characters only match then column "L" ," NOT DYED " word should change to " PART DYED "
i think my question can understand.pls make macro for this.thanks a lot.