I have a custom map in which I want to disable the market building. Could anyone help me out please, how to do it?

By looking at the RMS guide:
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You can not disable the building as it's triggered by Feudal Age. What you can do is modify the attribute ATTR_TRAIN_BUTTON, put it to 0 or some very big number so it doesn't appear. I'm not sure how the hotkey will react, though. You can also set their health to negative so it dies instantly.

your answer is awesome but it takes me nearly 2 to 3 days to understand. thank you very much

Sorry, I know a lot of modding and assume that people that ask this questions have some understanding and are just asking for second opinions.

The point is that throught the ATTR_SET command you can modify attributes of units, maybe some of them help your purpose.

Actually, there's also the ATTR_DISABLE command. That one could work or serve a different purpose with similar name.

You should write something like:

never mind, thanks again for helping me out! I keep trying.

Here's the RM Script I am not getting any idea. Where to place those lines

I found the simplest way to do it. Just hide the button:

Write this before the <PLAYER_SETUP> section
and inside the <PLAYER_SETUP>:
Here is a full example, for an Arabia-like map:

ok thanks. I will do it

Didn't work. Th game has just got stopped!

here's the screen shot attached. PFA

Here is the RMS file I changed as you said!

If that's original AOC, I believe you have to define some extra stuff,

In Wololokingdoms and later versions of the game, they are programmed in the game. Otherwise, you have to define them

ok I try and give a reply

Thank you Very Much Its working

Glad I could help, enjoy.