Adding file name information to CSV file columns

Is there a simple way to combine the functions of this Powershell script? It would be nice to have it file to one output file instead of several output files.

    GET-DATE
WRITE-EVENTLOG -logname Application -Source BLERG -EventID 1000 -entrytype Information -message "START CBM_PARSE.ps1" -category 1
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$SA_Location = "E:\Users\jsweeton\Documents\SITES\CBM\Storage Analysis\CBM-FS3"
SET-LOCATION $SA_Location
$filenames = @(GET-CHILDITEM $SA_Location -recurse -include *.csv)
$regex = '^([^-]+-[^-]+)-([A-Z])-(\d{4})(\d\d)(\d\d).+'

# $PIPE = ","
$PIPE = "$([char]0x2C)"

# $SLASH = "\"
$SLASH = "$([char]0x5C)"

# $DSLASH = "\"
$DSLASH = "$([char]0x5C)$([char]0x5C)"

foreach ($file in $filenames) {$outfile = "$file" + ".out"
$ReplaceString = ($file | Split-Path -leaf) -replace $regex,'$1|$3-$4-$5|$2:'
((GET-CONTENT $file| Out-String).Substring(7))  | FOREACH-OBJECT -Verbose {
       $_ -replace "\\","\\" `
        -replace $PIPE,"|" `
        -replace "E:",$ReplaceString `
    } | SET-CONTENT  $outfile
}
GET-DATE
WRITE-EVENTLOG -logname Application -Source BLERG -EventID 1002 -entrytype Information -message "END Parsing" -category 1
ECHO "END PARSE"
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GET-DATE
WRITE-EVENTLOG -logname Application -Source BLERG -EventID 1000 -entrytype Information -message "START CBM-FS3" -category 1
GET-CONTENT (GET-CHILDITEM "E:\Users\jsweeton\Documents\SITES\CBM\Storage Analysis\CBM-FS3\*.out") | out-file -encoding "UTF8" "C:\Users\jsweeton\Documents\SITES\CBM\Storage Analysis\CBM-FS3\CBM-FS3.txt"
WRITE-EVENTLOG -logname Application -Source BLERG -EventID 1002 -entrytype Information -message "END CBM-FS3" -category 1
ECHO "END CBM-FS3"
<#
GET-DATE
WRITE-EVENTLOG -logname Application -Source BLERG -EventID 1000 -entrytype Information -message "START CBM-FS56" -category 1
GET-CONTENT (GET-CHILDITEM "C:\Users\jsweeton\Documents\SITES\CBM\Storage Analysis\CBM-FS56\*.out") | out-file -encoding "UTF8" "C:\Users\jsweeton\Documents\SITES\CBM\Storage Analysis\CBM-FS04\CBM-FS04.txt"
WRITE-EVENTLOG -logname Application -Source BLERG -EventID 1002 -entrytype Information -message "END CBM-FS56" -category 1
ECHO "END CBM-FS56"
#>
GET-DATE
WRITE-EVENTLOG -logname Application -Source BLERG -EventID 1002 -entrytype Information -message "END CBM_PARSE.ps1" -category 1
ECHO "END END"
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