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Justin LJustin L 

Limiting results of PageBlockTable to records related to a parent object (Visualforce)

I am very new to Visualforce (last job had its own VF programmer, now I'm having to pick it up), and created a page that creates a list of items, and a button to access the page from the parent, in this case, contracts.  The related list is Contract Items (contract_item__c) and I would like to limit the contract items to only the ones related to the specific contract I launch the page from.  I'm sure this is answered somewhere, but I apparently do not know what I am looking for, as 2 days of searching has brought me close but not quite there.
<apex:page standardController="Contract_Item__c"
           tabStyle="Contract_Item__c" sidebar="false">
  <apex:form >
    <apex:pageBlock >
      <apex:pageMessages />
      <apex:pageBlockButtons >
        <apex:commandButton value="Save"
        <apex:commandButton value="Cancel"
      <apex:pageBlockTable value="{!CI}"
        <apex:column value="{!}"/>
        <apex:column headerValue="Item">
          <apex:outputField value="{!c.Item__c}"/>
        <apex:column headerValue="Price">
          <apex:inputField value="{!c.FS_Price__c}"/>
        <apex:column headerValue="Rebate">
            <apex:inputField value="{!c.Rebate__c}"/>
        <apex:column headerValue="Volume">
          <apex:inputField value="{!c.FS_Volume__c}"/>

Best Answer chosen by Justin L
You cannot restrict data in standard record set -reccordSetVar
You can create a VF page based on contracts and show only related list pertaining to Contract Item.In list attribute you have to pass relationship name.

<apex:page standardController="Contract">
         <apex:relatedList list="Contract_Items__r" />

If you don't want this way, you need to create an extension class to your existing VF page and get the required collection like below and expose them in a VF page

public class ContractItemExtension{
    List<Contract_Item__c> l{get;set;}
    public ContractItemExtension(ApexPages.StandardController c){
        l=[select id,name from Contract_Item__c where contract__c=:ApexPages.CurrentPage.getParameters().get('id')];