Create sharepoint Site column and Content Types through powershell

Use the below code in Powershell file

$snapin = Get-PSSnapin | Where-Object {$_.Name -eq 'Microsoft.SharePoint.Powershell'}

if ($snapin -eq $null) {

Write-Host "Loading SharePoint Powershell Snapin"

Add-PSSnapin "Microsoft.SharePoint.Powershell"

}

$site = Get-SPSite http://WebApplication:777

$web = $site.RootWeb 

$fieldXML = '<Field Type="Text" ID="{20152dbc-7793-46cb-bc0d-5dd98b0aa1a4}" StaticName="Col1" Name=" Col1" DisplayName=" Col1"

            Description="A document classification ." Required="TRUE" MaxLength="255"

            Group="RDM Site Columns"  ></Field>'

write-host -foreground "green" "Adding Site Column"

$web.Fields.AddFieldAsXml($fieldXML) 

$fieldXML =  '<Field Type="Note" ID="{2808ba7f-78a9-4930-8840-385a18e85b53}" StaticName="Col2" Name=" Col2" DisplayName=" Col2"

        Description="The type of business conducted at a site." Required="FALSE"  NumLines="6" RichText="TRUE"

        Group="RDM Site Columns"  ></Field>'

write-host -foreground "green" "Adding Site Column"

$web.Fields.AddFieldAsXml($fieldXML) 

$fieldXML = '<Field Type="Choice" ID="{ce7f74d7-fc8c-4844-85a9-903e208e68d2}" StaticName="Col3" Name=" Col3" DisplayName=" Col3"

        Description="The status of a complete location." Required="TRUE" Group="EICM Site Columns" >   

<CHOICES>

      <CHOICE>Active</CHOICE>

      <CHOICE>InActive</CHOICE>

      <CHOICE>Pending</CHOICE>

    </CHOICES>

    <Default>Pending</Default>

  </Field>'

write-host -foreground "green" "Adding Site Column"

$web.Fields.AddFieldAsXml($fieldXML) 

 

Write-Host -foreground "green" "Creating Content Type-CT1 ...."

$ctypeName = “CT1”

$ctypeParent = $web.availablecontenttypes["Document"]

$ctype = new-object Microsoft.SharePoint.SPContentType($ctypeParent, $web.contenttypes, $ctypeName)

$ctype.Group = "CT"

$ctype.Description = ""

$web.contenttypes.add($ctype)

 

$field = $web.fields.getfield(“Col1”)

$fieldLink = new-object Microsoft.SharePoint.SPFieldLink($field)

$ctype.fieldlinks.add($fieldLink)

$field = $web.fields.getfield(“Col2”)

$fieldLink = new-object Microsoft.SharePoint.SPFieldLink($field)

$ctype.fieldlinks.add($fieldLink)

$field = $web.fields.getfield(“Col3”)

$fieldLink = new-object Microsoft.SharePoint.SPFieldLink($field)

$ctype.fieldlinks.add($fieldLink)

$ctype.update()

 

If u need to delete any field in child CT which got inherted from Parent CT then you can use the below code 

 

Write-Host -foreground "green" "Creating Content Type-CT2 ...."

$ctypeName = “CT2”

$ctypeParent = $web.availablecontenttypes["CT1"]

$ctype = new-object Microsoft.SharePoint.SPContentType($ctypeParent, $web.contenttypes, $ctypeName)

$ctype.Group = "EICM Content Types"

$ctype.Description = ""

$web.contenttypes.add($ctype)

 

$field = $web.fields.getfield(“col1”)

$fieldLink = new-object Microsoft.SharePoint.SPFieldLink($field)

$ctype.fieldlinks.Delete($fieldLink.Id)

$ctype.update()