Joining a list with a string

hello im curious to know if there is a way to join and work using a list, basically i have a XML with several INVOICES some have multiple and some have 1 so i created a list with all then i would like to join this XML with another document as long one of the INVOICES match and then using a string manipulator change the value from that list in the XML to the new value from the new document

after all that i will transform the XML column back into XML and take out of Knime

maybe another form would be separating the XML changing the values and then fusing the document back together?

is there any way to do any of these?