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Asad WaliAsad Wali 

Customize custom feild if user enter no. of item. is display objects.

  1. Create custom object with name Item and add Account field as a reference. (It should be visible in related list of Account)
    1. Add custom field with name Amount in Item object.
    2. It should be currency field with 2 digit values.
  2. Add custom field (integer) with name No. of items in Account. It should be mandatory.
    1. On creation of account, create user specified number of items.
    2. Names should be like Item 1, Item 2, … Item n.
  3. Add summary field in Account to show sum of Amount of all Items.
ANUTEJANUTEJ (Salesforce Developers) 
Hi Asad,

Are you facing any issues while implementing the above scenario you have mentioned and in case if you are facing any errors as such you can mention them here so that we can check them further?

In case if you are looking for a full implementation I think you can try checking the trailhead as the above implementations seem to be ones that can be simple to do using UI.

I hope this helps and in case if this comes in handy can you please choose this as the best answer so that it can be useful for others in the future.

Regards,
Anutej