Welcome to the CRM forum. You probably should read the sticky post before posting any more questions here. So if you want to find your answer you will first need to know what type of data you want to extract. Depending on the type of data in CRM it will cause a different method for uploading.
In general your best bet is to search this forum using a search in this type of fashion say for business partners:
"Business partners BAPI'
"Business partners XIF".
If you set the search for all of time once you get results there are 1000's of posts on this topic.
However you need to explain what type of data you want to load in first and do a search and then if you have a specific questions on how to use a particular tool available in CRM, then ask it.
Take care,
Stephen
CRM Forum Moderator
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