Hi Ashish,

You can use inputField tag instead of inputtext. inputfield tag will inherit proporty of your orginal field. You can define you help text in the field of the object.  

For example:

If we have rating field on account. Ill update my help text in the field itself. Now in Visualforce page ill refer it using <apex:inputField value="{!acc.rating}"/>.


 

<apex:page controller="DML_2" tabStyle="Book__c" >
    <apeX:form >
        <apex:pageblock mode="edit">
            <apex:pageblockbuttons location="Top">
                <apex:commandbutton value="Create" action="{!Create}"/>
                <apex:commandButton value="Cancel" action="{!Cancel}"/>
            </apex:pageblockbuttons>
            <apex:pageBlockSection title="Accounts" collapsible="false" >
                <apex:inputField value="{!acc.Name}"/>
                <apex:inputField value="{!acc.Phone}" required="true"/>
                <apex:inputField value="{!acc.industry}"/>
                <apex:inputField value="{!acc.rating}"/>
            </apex:pageBlockSection>
            <apex:pageBlockSection title="Contacts" collapsible="false">
                <apex:inputField value="{!con.lastname}"/>
                <apex:inputField value="{!con.firstName}"/>
                <apex:inputField value="{!con.phone}"/>
                <apex:inputField value="{!con.email}"/>
            </apex:pageBlockSection>
            <apex:pageBlockSection title="Opportunity" collapsible="false">
                <apex:inputField value="{!opty.Name}"/>
                <apex:inputField value="{!opty.stageName}"/>
                 <apex:inputField value="{!opty.User_Manager_The_Opportunity_Name__c}"/>
                `<apex:inputField value="{!opty.closeDate}"/>
            </apex:pageBlockSection>            
        </apex:pageblock>
    </apeX:form>
</apex:page>

Thanks,
Ashish Singh.