How to remove OS options on Windows boot menu

1.Press "Win+R" and type "cmd" to open Windows Command Prompt.
2.Type "bcdedit" and enter, you'll see all of OS options.
3.Type "bcdedit /delete {identifier}" to remove it which you want.
4.It will show "The operation completed successfully." message after finished.

How to merge many .swm files to one .wim file

1.Download the Assessment and Deployment Kit (ADK) from MSDN subscribers download.
2.Install ADK by running adksetup.exe, and make sure that Windows Preinstallation Environment is selected (selected by default).
3.Copy your .swm files to path D:\
4.Open "Deployment and Image Tools Environment" as administrator.
5.Type "imagex /ref D:\xxx*.swm /check /export D:\xxx.swm * D:\install.wim Windows /compress maximum".
6.It will be exporting to install.wim file now.

Windows 10 Pro RTM (Build 10240) Autounattend.xml

 For x64:

<?xml version="1.0" encoding="utf-8"?>
<unattend xmlns="urn:schemas-microsoft-com:unattend">
    <settings pass="windowsPE">
        <component name="Microsoft-Windows-International-Core-WinPE" processorArchitecture="amd64" publicKeyToken="31bf3856ad364e35" language="neutral" versionScope="nonSxS" xmlns:wcm="http://schemas.microsoft.com/WMIConfig/2002/State" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
            <SetupUILanguage>
                <UILanguage>en-us</UILanguage>
            </SetupUILanguage>
            <InputLocale>en-us</InputLocale>
            <SystemLocale>en-us</SystemLocale>
            <UILanguage>en-us</UILanguage>
            <UILanguageFallback>en-us</UILanguageFallback>
            <UserLocale>en-us</UserLocale>
        </component>
        <component name="Microsoft-Windows-Setup" processorArchitecture="amd64" publicKeyToken="31bf3856ad364e35" language="neutral" versionScope="nonSxS" xmlns:wcm="http://schemas.microsoft.com/WMIConfig/2002/State" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
            <UserData>
                <ProductKey>
                    <Key>W269N-WFGWX-YVC9B-4J6C9-T83GX</Key>
                    <WillShowUI>Never</WillShowUI>
                </ProductKey>
            </UserData>
        </component>
    </settings>
</unattend>