Determine Row Of Data In A Table Through SSIS

I have a requirement based on 2 parts to determine a row of data in a table through SSIS :

a. Work out the LEG_SEQ_NBR of the VESSEL, VOYAGE and LEG already stored in table1.

To do this join table1 and join table2 through BL_ID column.

b. Work out the 2ndVESSEL, 2ndVOYAGE and 2ndLEG.

Once we have identified the LEG_SEQ_NBR of the VESSEL,VOYAGE, LEG already stored in table1 we need to add '1' to this value and then find that LEQ_SEQ_NBR in table2.

The DDL of table1 and table2 along with the test data are as below:

CREATE TABLE [dbo].[table1](
[BL_ID] [decimal](10, 0) NOT NULL,
[VESSEL] [nvarchar](10) NULL,
[VOYAGE] [nvarchar](12) NULL,
[LEG] [nchar](3) NULL,

[Code] ....

For Example:

BLNO = 21 and BL_ID = 1

Current Vessel/Voyage/Leg in table1 = CEUR 032E E

LEG_SEQ_NBR of this Vessel/Voyage/Leg in table1 = '1'

Therefore if we add '1' to this value we'd be looking for LEG_SEQ_NBR '2' as the 2ndVESSEL,2ndVOYAGE,2ndLEG.

In this case that would = MARB 794S S

How this can be worked out through an SSIS job ?