@ManishaDM if you absolutely must you can use the MEMO format to store larger strings in MS Access:
CREATE TABLE SampleTable (
ID AUTOINCREMENT PRIMARY KEY,
LargeTextField MEMO,
Description TEXT(255)
);
kn_forum_72872_ms_access_large_text_variable.knwf (128.9 KB)
But as @ScottF has said. You might want to consider using an alternative SQL database