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another question. I i have a selection of leads/contacts, how can i embed this view in external website?

You can use REST API to integrate Bitrix24 with external website. Here is the general API documentation: https://training.bitrix24.com/rest_help/ and here are the instructions on how to work with API in Bitrix24 (https://www.bitrix24.com/apps/dev.php) in case you need any assistance with API please contact our partners [https://www.bitrix24.com/partners/], they will be glad to help you.