When you are working on a consumer case in NextChapter and you need to cross collateralize property with claims, the most efficient process is to add all of your Personal Property first. Once you are ready to add in Secured Claims, you will have the option to select multiple pieces of property that you have entered and tie them all to the same claim.
Where in NextChapter: Personal Property > Add New Property
After the property is entered, go to Secured Claims > Add New Claim and click on the Asset dropdown
Select the Multiple Assets option
Once you have selected Multiple Assets an additional modal will appear beneath your selection that allows you to select all property secured by this lien. Click in the box where it says "search assets" and a list of all previously entered assets will appear. You can continue selecting property, and add as many items as needed.