Thats for your time... yes there was a reason to use Access as data manipulation which would be required later would be easier using queries.
I fixed my issue... by revamping the total code.
1. I created tables in access.. whereever I knew that the field size would be > 255, I made those column memo.
2. I wrote a VBA script to read the data cell-be-cell from excel file and insert into table.
3. on the click of another button, teh VBA code uses DoCmd and executes a query.. In the query - I have broken the Description filed into 5 - so the queyr looks somewhat like -
Description, MID(Description,1,250) as D1, MID(Description,251,250) as D2,MID(Description,501,250) as D3, MID(Description,751,250) as D4,
4. After populating the results in excel file using DoCmd - I wrote VBA script to
1. concatenate the D1,D2,D3,D4 values and display that in the Description field.
2. delete the D1,D2,D3,D4 fields. The deletion was sequenced in the reverse order to ensure no column reference changed post deletion of columns.
Thanks all for your help.