Hello lincoln,
Yes you can manage all your contacts as a single vCard file for this please follow this step:-
Step 1 :- Copy all your thousands of contact (.vcf) files into any one particular folder or directory.
Step 2 :- After copying all contact into single folder, now , press shortcut key ” Windows + R ” or go to option and open windows command prompt.
Step 3 :- Type ” CMD ” in windows command prompt, as you enter these, command prompt will open.
Step 4 :- As command prompt opens, now navigate to the folder/directory where you have stored all your contact files.
Ex :- Type the drive name and then folder
D: [Press Enter]
Cd allcontacts [Press Enter]
Step 5 :- After navigating to that folder/directory, enter following DOS command:
” copy *.vcf all.vcf ” – For copying .vcf files.
Step 6 :- Wait for a moment as all your contacts get merged, it will take few seconds.
Step 7 :- Now go to that folder/directory where you had copied all your contacts. You’ll find one merged “all.vcf ” file of few KB’s, just import that single .vcf file wherever you need like on google account, smart phone.