The drum sample-sure, you can do it that way but I believe you are using tracking/mastering software and not loop based creation software so it will extremely slow going a tedious.
You could do the old ctrl-C, Ctrl-V v v v v v v v v v v copy/paste method if your scroll bar lines up correctly after each paste.
The frustration will set in when you start wanting to change the pitch or stretch the sample because it is
Mixcraft makes it easy to repeat samples. You don't have to paste multiple copies of a sample.
Once you have a sample, you just grab the right edge and drag it out to the right for however long you want it to be.
Mixcraft just creates one long back to back repeat of the sample.
There's a little V notches at the top of the long sample showing you where the samples repeats.
I can line the sample up witn the drum beat using those little notches.