The MacVector Assembler module lets you create projects, populate them with Sanger Sequencing or NGS data files (or any sequences in a format that MacVector can read) and then assemble them using the popular phrap and/or Velvet assemblers. Typically, the result will be a collection of contigs that you might want to use in additional analyses. Simply select the contigs you are interested in and choose File | Export…
In the file dialog that appears, make sure you select either the fasta or fastq options to save all of the consensus sequences into a single file.
You can use the saved file in additional assembly experiments, or as a “database” for Align To Folder searches, or import them into an Align To Reference assembly.