How can I embed one form onto another form?

how to insert an existing form into another existing form

Do you mean you want to embed one form onto another?

If so then you can do that with our iFrame Widget.

Add the iFrame Widget on the first form then insert the url of the second form into the widget on the first form and wallah! 

Here's an example form - https://form.jotform.com/60824992264968 

It has two forms embedded on it using the iframe widget.

I would like to make the jump to the link. Name forms http://www.jotformeu.com/Komarikfonarikru/avon , and the reference tab "Catalog" https://form.jotformeu.com/Komarikfonarikru/katologi more. Clear?

Unfortunately, I do not understand what you mean by that and jump the link.

Do you maybe mean link a form tab on your first form to your catalog form (second form)?

I would like when I press the tab called "Catalogue" I have found in the link http://www.jotformeu.com/Komarikfonarikru/avon/catalogue

I click on the next tab titled "Contact" link in the prescribed http://www.jotformeu.com/Komarikfonarikru/avon/contact

and I wrote the same http://www.jotformeu.com/Komarikfonarikru/avon

and generally cool shape, this is a godsend for me, thank you