Im basically from India, my company provides services such as Product Design ,Electronic, Mechanical, Development, Prototyping, Manufacturing of Plastics, Rubbers, Sheet metals, Machined parts, Work and test benches, PCB,etc, We even help startups. We always supply with good quality products as per any specific standards, provide competitive pricing and ensure that our customer is satisfied and build a long term relationship with them. We do have few big customer in US and Europe, but i want to i increase my customers and find more companies to supply to in US and Europe, basically marketing my services there?
In Europe, there are a number of partnership sites for B2B as you're implying. You could use these sites to post your offer or search for other offers and hopefully make a match.
Another approach is considering hiring local distributors who specialize in your industry. The advantage here is local distributors will already have a strong network to promote your products/services. Furthermore, local distributors would have thorough understanding of the local market,language, and business culture to close deals.
If you find my answer helpful, I'd be happy to give you straight to the point call on how to find local distributors.