I have following script:
#Retrieving the Web Site with List
$MyWeb = Get-SPWeb "http://MySite"

#Get the List name
$MyList = $MyWeb.Lists["MyList"]

#Get The View
#Change the name of the view
$MyView = $MyList.Views["My View"]

#Get the Items from the view
$MyItems = $MyList.GetItems($MyView)

#Get Specific field items and export it to a csv file
$MyItems | %{ select-object -input $_ -prop @{Name='ID';expression={$_.ID;}}, @{Name='Content Type';expression={$_["x. Type"];}}, 
@{Name='Item Name';expression={$_["Item Name"];}}, @{Name='Categories';expression={$_["Categories"];}}, 
@{Name='Item Activity';expression={$_["Item Activity"];}}, 
@{Name='attending';expression={$_["attending"];}}; } | Export-Csv -Path C:\MyExports\export.csv

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Now, the categories field is a lookup field how do use substring after function for the look up field so that I get the text after "#" character?
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I'm not sure if I understand exactly what you're looking for, however try this and see if it fits.  BTW, it's simpler to just pipe to Select-Object, rather than using it within a ForEach so I modified the code to do that.
#Get Specific field items and export it to a csv file
$MyItems | select-object -prop @{Name='ID';expression={$_.ID}},
                                @{Name='Content Type';expression={$_["x. Type"]}},
                                @{Name='Item Name';expression={$_["Item Name"]}},
                                @{Name='Categories';expression={ ($_["Categories"]).substring(($_["Categories"]).IndexOf("#")+1) }},
                                @{Name='Item Activity';expression={$_["Item Activity"]}},
                                @{Name='attending';expression={$_["attending"]}} |
 Export-Csv -Path C:\MyExports\export.csv

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TechsavyAuthor Commented:
Hi footech,

Thank you for the solution. What function I use to get anything before ';#' to get the ID of the LookupList Item? SharePoint Stores lookup field values as 1;#LookupValue so, I need to extract the string before ;# it could be any number.
I don't understand what you're asking.  I don't have a environment where I can test this out so you'd need to show me exactly what is being returned now.  Let me know if the code I provided is working for you.  Is this a separate question than your first one, or do you just need a modification of what I provided?
TechsavyAuthor Commented:
Hi footech.

The solution that you gave me worked for the case where I wanted to return everything after '#'. But now I need to find a way to extract everything that appears before ';#' in a string that is always formatted 12;#somestring. Please note that the number before ;# could be anything from 1 to 20000
So the first expression was
To return what's before ";#", you could have
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