When referencing a subprocess from the main process in AEM Workbench, the Input tab in the process properties only shows an option to pass a literal value. The option to pass a variable is not appearing. Has anyone else encountered this issue? Workbench Version: 6.5.0

Try to set the top/bottom margin to 0.   Or the one workaround could be set the bottom border of the cell to "None"

For custom components, you need to write the code in Java and then need to write your class and operation detail in component.xml. Then need to create a jar file and install it on the server,   then you can use that custom component in your process. Search for document service component in Adobe Lc ...

Share your form at vkatoch07@gmail.com, I'll have a look.   One approach is bind the image fields with the images you want and then show/hide the image fields based on your conditions.

So my question is there should be some condition on which you need to hide the logo on some pages. Can you please apply that condition on the footer in the javascript code?

Saving each individual pdf per record in the xml data is possible through AEM forms output service, you will not achieve this with AEM designer.

Go through this, its very simple https://help.adobe.com/en_US/livecycle/10.0/DesignerHelp/WS107c29ade9134a2c136ae6f212a1f379c94-8000.html  

Check this if it help: https://help.adobe.com/en_US/AEMForms/6.1/DesignerHelp/WS92d06802c76abadb-728f46ac129b395660c-7f83.2.html#:~:text=high%20resolution%20output.-,Select%20File%20%3E%20Form%20Properties.,Document%20And%20Its%20Security%20Settings.  

Tou need to make the field expand to fit in the layout tab.   scribble signature feature not available in pdf form yet i think, in pdf digital signature used

Write the below script to reset the subform data.   xfa.host.resetData("somExpression of your subform will come here");   eg.:  xfa.host.resetData("xfa.form.form1.testVk");   testVk is my subform name here and form1 is my page name