Hello!
Yes, you can display information in a document template from a subprocess.
To display a process field or subfield in a document template, you need to make a variable.
First, we substitute the template {row:suborder_*} and instead of an asterisk we put the variable we need, for example
process name {row:suborder_name} or client name {row:suborder_clientname}.
If an additional field is needed, then the variable will look like this {row:suborder_customOrder_XXX} , where XXX is the ID of the process's additional field.
All variables must be taken from the variable reference in the document constructor, here
https://prnt.sc/x5szbqSubprocess products cannot be output to a document.