More options for single product page.

hello.

i need help with 2 problems. i am making ‘print on demand’ website, where i design art and then print it on t-shirts, hoodies, mobile cases, etc.

1. so for example i make pizza design and i sell them on all merch, so when customer visit my pizza t shirt single product page i wanted to show other products like this pizza design is also availabe in hoodie, mobile case. is there any plugin that does this??

2. is there any easy way to upload bulk product like teepublic.com. where you upload a design, then give a name and description and the plugin creates all products like t-shirts, hoodies, cases etc. automatically?