Please try to explain your question in more detail so that the members can easily understand your requirement.

What I understand is that you need an approval process for a particular option for a screen having a kind of a transaction.

You can follow these steps:

Add one more column in your table, for example:

alter table your_transaction_table add approval_status(1) default 'N';

Now suppose for the above table, a transaction happened by the user through an Apex screen and that users have some limited privileges.

Create one more button, or you can create on more screen for the users having approval privileges, that will be visible for these users only.

Now create a process to update that column we added for a particular transaction. For example:

Update your_transaction_table
    set approval_status = 'Y'
  where tran_id = :Px_YOURITEM;

That way, you can approve a particular transaction. You can also add one more column for the approval_user and can update it so that you can know who approved the record.

If this does not solve your query, then please provide more details for your requirement.