we all are well introduced about Fritzing. It is a Nice app for PCB designing. It gives great features and most advantageous thing is that "It is a Open Source" project. you can also read about Fritzing on wikipedia
But we know it is in Beta version, Many times I faced a problem lack of parts. Once I searched Ht12E IC, but didn't get any result so I decided to create HT12E IC
Step 1: Select a IC
After opening Fritzing
select a IC (any)
Step 2: Change the Pin No.
We are going to create HT12E IC, It is 18 PIN IC , at the Right side select PIN =18, because HT12E is 18 pin IC
Step 3: Go to Edit
Now right click on IC and open EDIT
Step 4: Goto Metadata
now change the label and chip label, and make another changes
Step 5: Goto Connectors
now assign name of every pin.
Step 6: Goto Icon
Now click file and click "Reuse Breadboard Image"
Step 7: Save As...
Now click file and click "Save a New Part"