How to set column attributes in table control?

I have the following requirement to build a table by using table control:
if content of col 1 = 'Y', enable input for col 2 for that line only.
if content of col 1 = 'N', disable input for col 2 for that line only.
So the input attribute for col 2 in each line can be different.
How can I achieve this?
I have tried using loop at screen or loop at tablecontrol-cols into wa_cols statements,
but these will change the entire column attributes to either on or off, and not on individual line.
Instead of changing the COLUMN attributes, I think I should change the CELL attributes.
What is the syntax for that, is there something like tablecontrol-field?
Thanks for any help in advance.

I still not able to get the field attributes set on individual lines.
These are my codes, can you help again.
PROCESS BEFORE OUTPUT.
MODULE pbo_0200.
MODULE zitem_change_tc_attr.
LOOP AT   lt_asset_item
       INTO ls_asset_item
       WITH CONTROL zitem
       CURSOR zitem-current_line.
    MODULE ZITEM_CHANGE_FIELD_ATTR.
    MODULE zitem_get_lines.
ENDLOOP.
MODULE zitem_change_field_attr OUTPUT.
loop at screen.
if ls_asset_item-replace_asset = 'X'.
     if screen-group1 EQ 'FR4'.        "these are the columns I want to turn input ON or OFF.
      screen-input = '1'.
      modify screen.
     endif.
endif.
endloop.
Endmodule.
At debug mode, the screen-input did change to '1'. Can I check the return code of the MODIFY SCREEN statement?
I tried to initialize the colums to be output only at screen definition, but it still doesn't help.
I don't think I have to do anything at the PAI event.
PROCESS AFTER INPUT.
MODULE save_cursor_position.
LOOP AT lt_asset_item.
   FIELD ls_asset_item-replace_asset
     MODULE get_replace_asset ON REQUEST.
    CHAIN.
     FIELD LS_ASSET_ITEM-REPLACE_ASSET.
     FIELD ls_asset_item-replace_cost.
      MODULE zitem_modify ON CHAIN-REQUEST.
    ENDCHAIN.
    FIELD ls_asset_item-mark
      MODULE zitem_mark ON REQUEST.
ENDLOOP.
MODULE zitem_user_command.
Thanks again.

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