Check two columns and update other table

HI ,

I have a table called trackCenterline .Below is the table.

What i want to do is If the segmentSequenceID is 1 it should pick the corresponding SegmentID i.e 10001 and Check for the same segment id in other table called TrackSegment which is below.  and pick the BeginMilepost of that segmentID and Update That Milepost in a new table .At end SegmentSequenceID number it should pick ENDMilepost and update

TrackCenterline table.

TrackSegment table

In the below table for 10001 SegmentID it should pick BeginMilepost. For end Number of SegmentSequenceID in above table ID ends at 121 for that end sequenceID It should refer TrackSegment table below and pick EndMilepost and should be updated in another table Milepost column.

after that a new segment starts with new sequence .and so on ...

bhavana