This was kind of maddening but it's basically exactly the same as this online tip:
PUBMED
Endnote: Search a topic, then make a Group for "PMC" articles within them
Search for title word "tumor mutational burden"
Find 100
Import to Group TMB
Search re-search the same topic PLUS the criterion: (drop down menu) Subset: (text) free full text (30)
Online in manual pubmed this would be free full text[sb]
You get 30 articles
Import to Group TMBPMC
Now you have 130 total articles and 30 dups.
Here's what you do next.
In ALL, use the function, References / Find Duplicates.
All the paired articles will show, with the second line in each pair highlighted. (This is samea s the special folder PMC which has 30 articles.)
Delete (move to trash)
Now you are looking at the original sister article of the ones you deleted. They are in TMB, being 30 among the 100 which are exactly the same as the ones you just put in TMB PMC, then deleted as duplicates.
Drag these to TMBPMC, which is now refilled with 30 again. But, they are the 30 from the original 100.
It is sort of like taking a wax impression, throwing away the original, and then casting a new original from the wax mold.
zendnote
NOTE 1
Most of the free text articlesin Pubmed have a PMC ID, but not all. Don't worry. They should still have a free text online at NLM that Endnote can still find, if you ask it to. (References > Find Full Text).
NOTE 2
The search fields are maddening.
When you are IN the web search, you get NLM fields like Subset and PMCID but can only use the mode CONTAINS.
If you are in the downloaded library, you get FEWER fields, but you get many options for search (starts with, greater than, etc)
You either get lots of fields and few search options (contains). or fewer fields and many search options (starts with).