Add Summary Box for displaying Total Amount in Item Receipt

Add a custom transaction body field of type Inline HTML.
For that go to Customization > Lists, Record, & fields > Transaction Body Fields
Add Label, select type as Inline HTML.
Under ‘Applies To’ subtab check Item Receipt
Under Validation and Defaulting subtab, add the below code in DEFAULT VALUE

' <style> 
 .ITEMRECEIPT_summary{ 
 font-size: 12px; 
 } 
</style> 
<table class="totallingtable" cellspacing="0" cellpadding="0px" border="0px"> 
<caption style="display: none">Summary</caption> 
<tbody> 
<tr> 
<td border:"1px"> 
<p style="font-size:12px"> 
 TOTAL  
</td> 
<td> 
<strong class=" ITEMRECEIPT_summary ">'||{custbody17} ||'</strong> 
</td> 
</p> 
</tr> 
</tbody> 
</table> '

Here ‘custbody17’ holds the total amount which is to be added to Summary Box.
Click on Save & Apply to Forms.
Summary Box will be added in Item Receipt.