Doubt regd Field Symbols

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Hi SDN's

I have createad dynamic internal table using the method cl_alv_table_create=>create_dynamic_table from the blog

/people/rich.heilman2/blog/2005/07/27/dynamic-internal-tables-and-structures--abap

i am struck at the last point. what i wanted to know is the the internal table is in the form of a Field Symbol <FS> . But i have an internal table which already contains the data.. how do i move the data from internal tables to the Dynamic internal table.. I had already posted previously, but not able to understand .. can some body help me in understanding to get the data from Internal table to the dynamic internal table

<b>My internal table</b> is in the below format

Alloc no|ChargeCode	|Amount	|
---------------------------------
A119	|301		|100	|
A119	|301		|200	|
A119	|302		|150	|
A119	|302		|250	|
A119	|303		|100	|
A229	|301		|100	|
A229	|321		|100	|
A239	|301		|100	|
A239	|303		|50	|

and i have the <b>dynaic internal table</b> format as below

Alloc No|301	|302	|303	|321	|
-----------------------------------------
A119	|300	|400	|100	|NIL	|
A229	|100	|NIL	|NIL	|100	|
A239	|100	|NIL	|50	|NIL	|

Please help me in understanding to move the data in to the above format